Question: What literature was the word proton first used in?
About the article "Proton", section "History".

Candidate passages:
The Proton Wira, also as known as the Proton 400 Series is a car manufactured by Malaysian carmaker Proton.
It was produced in four-door saloon and five-door hatchback guises and is based on the Mitsubishi Lancer platform.
Proton made minor changes to the taillights, bumpers, and dashboard.
5 trim levels were available.
The 1.6 and 1.8 litre model(4G92/4G93) were equipped with rear disc brakes, front and rear armrests, electric mirrors, folding rear seats, electric windows on all doors, and a high quality interior.
Proton redesigned the saloon to make a 5-door hatchback variant during the mid-1990s, basing the car on the saloon Wira and sporting similar tail lights.
The entry-level 1.3 and 1.5 models lack some of the features of the 1.6 and 1.8 models to cut down costs and thus lower the list price.
These models used 4G13 and 4G15 engines.
The early models used carburettors, in 1998 Proton replaced them with EFi injection.
However, in 2001 Proton replaced the Mitsubishi EFi module with Siemens VDO module that is claimed to cause slight power loss.
In 2000, the interior trim of all Wira models changed to grey.
Same with the seats material had been changed to new softer batik-like designs.
The Wira was to be replaced by two similar in-house designed Proton cars: The Proton Gen-2 (launched in 2004 to replace the "Aeroback" hatchback variant) and the Proton Persona (launched in 2007 to replace the saloon variant).
The Proton Waja, a saloon compact, was also launched in 2001 as an earlier successor to the Wira saloon, but currently caters slightly towards more upmarket demand, below the Proton Perdana.
"Wira" is a Malay word that translates into English as "Hero". 
On 15 August 1992, the Proton Saga Iswara was launched.
It shares the older Mitsubishi platform used in the original Proton Saga, but its exterior and interior styling are unique to Proton.
The Saga Iswara was widely used as taxicabs in Malaysia during the 1990s and 2000s, and many continue in service to the present day.
21 May 1993 witnessed the introduction of the Proton Wira, a car which was better equipped and larger than both the Saga and Saga Iswara.
The Wira is based on the fourth-generation 1991 Mitsubishi Lancer and was sold in a four-door saloon guise at launch.
The Proton Wira Aeroback, a five-door hatchback variant featuring a Proton-designed rear-end joined the range in 1994.
Both the Wira saloon and hatchback shared six different engines by 1996, all of which were sourced from Mitsubishi Motors.
The engines included the tried and tested 4G13 1.3L and 4G15 1.5L carried over from the Proton Saga, the newer 4G92 1.6L, 4G93 SOHC and DOHC 1.8L and the 4D68 2.0L diesel.
The Wira was the first Proton car to be produced in both right-hand drive (RHD) and left-hand drive (LHD) configurations, and remains the only Proton car made available with a diesel engine.
In 1995, Proton launched the three-door Proton Satria hatchback and the two-door Proton Putra coupé, both of which are based on the Wira platform and powered by the same range of Mitsubishi engines offered in the Wira, with the exception of the 2.0L diesel.
The Proton Wira saloon and hatchback as well as the Proton Satria and Putra were aggressively exported and marketed across the European Union and Middle East during the 1990s.
The Proton Perdana, a premium D-segment saloon was also launched in 1995 for sale exclusively in the Malaysian market.
It is based on the seventh generation 1992 Mitsubishi Eterna and was initially fitted with Mitsubishi's 4G63 2.0-litre l4 engine, but was offered with the superior 177bhp 6A12 DOHC 2.0L V6 engine after 1999.
The Perdana remains the only D-segment, V6-powered car to be commercially produced by Proton.
A Citroën AX-based 1.1-litre five-door supermini called the Proton Tiara debuted in 1996.
It was the result of a joint venture between Proton and PSA Peugeot Citroën, a collaboration which was later abandoned after the death of Proton's then CEO, Tan Sri Yahaya Ahmad in 1997.
On 30 October 1996, Proton acquired an 80% stake in Lotus Group International Limited, valued at £51 million.
The controlling interest was purchased from A.C.B.N.
Holdings S.A. of Luxembourg, a company controlled by Italian businessman Romano Artioli, then also the owner of Bugatti.
Proton's stake in Lotus was later increased to 100% in 2003.
The acquisition of Lotus witnessed the involvement of the British company in the development of suspension and handling elements of all Proton cars launched since 1996.
The Proton Satria GTi, widely regarded as the best Malaysian car ever produced owes much of its success to Lotus' contributions. 
The second generation Proton Saga is a 4-door subcompact sedan produced by Malaysian car manufacturer Proton which launched on 18 January 2008.
It succeeds the first generation Proton Saga as the company's flagship model.
The second generation Proton Saga is based on a stretched Proton Savvy platform and was developed in-house by Proton with technical support from Lotus Cars and LG CNS.
Proton launched a mid- life facelift model called the Proton Saga FL on 30 November 2010.
8 months later, a further improved model called the Proton Saga FLX was launched.
The Proton Saga is best known to have been named after the tiny red seed of the "Saga" tree ("Adenanthera pavonina"), commonly found in Malaysia.
However, Ismail Jaafar, a retired military soldier who won the car's pre-launch naming contest claims "Saga" was originally an acronym for "safety, achievement, greatness, ability".
The Proton Saga is also a well-known national symbol of Malaysia. 
Proton therapy is not experimental and has been used in the United States since 1946.
This machine is called a cyclotron.
IU Health Proton Therapy Center was fortunate enough to repurpose the cyclotron located on the Indiana University Cyclotron Facility (IUCF) from a research facility into a proton therapy center. 
 Enhanced.
On 7 July 2007, International Launch Services launched the first Proton-M Enhanced rocket, which carried the DirecTV-10 satellite into orbit.
This was the 326th launch of a Proton, the 16th Proton-M/Briz-M launch, and the 41st Proton launch to be conducted by ILS.
It features more efficient first stage engines, updated avionics, lighter fuel tanks and more powerful vernier engines on the Briz-M upper stage, and mass reduction throughout the rocket, including thinner fuel tank walls on the first stage, and use of composite materials on all other stages.
The second launch of this variant occurred on 18 August 2008, and was used to place Inmarsat 4 F3 into orbit.
The baseline Proton-M was retired in November 2007, in favour of the Enhanced variant.
Frank McKenna, CEO of ILS, has indicated that in 2010 the Phase III Proton design would become the standard ILS configuration, with the ability to lift 6.15 tonnes to GTO.
October 19, 2011 Viasat-1 weighing 6.740 tonnes has been lifted into geostationary transfer orbit by the Proton-M/Briz-M Phase III.