Papa M'Baye N'Diaye (born 11 May 1938) is a Senegalese sprinter.
 He competed in the 4 × 400 metres relay at the 1964 Summer Olympics and the 1968 Summer Olympics.
Achim Hill (April 1, 1935 – August 4, 2015) was a German rower who competed for the Unified Team of Germany in the 1960 Summer Olympics and in the 1964 Summer Olympics and for East Germany in the 1968 Summer Olympics.
 He was born in Köpenick.
 In 1960 he won the silver medal in the single sculls event.
 Four years later he won his second silver medal in the 1964 single sculls competition.
 At the 1968 Games he represented East Germany and finished fifth in the single sculls contest.
Daour M'baye Guèye (born 29 May 1937) is a Senegalese sprinter.
 He competed in the 4 × 400 metres relay at the 1964 Summer Olympics and the 1968 Summer Olympics.
Stoyan Angelov Pilichev (Стоян Ангелов Пиличев, born November 20, 1938, Chiroko, Bulgaria) was a Bulgarian boxer who competed in the lightweight category at the 1964 and 1968 Summer Olympics, as a member of the Bulgarian national boxing team.
 In the 1964 Summer Olympics he lost to Józef Grudzień from Poland in the quarter-final.
 In the 1968 Summer Olympics he lost to Calistrat Cuţov from Romania in the quarter-final.
 Pilichev represented Bulgaria in the lightweight category of the 1969 European Amateur Boxing Championships.
 After reaching the final, he faced Calistrat Cuţov from Romania, in a rematch of 1968 Mexico City quarter-final, and he lost on points, resulting in winning the silver medal of the division.
Ladislav Falta (born 30 January 1936) is a Czech former sport shooter who competed in the 1964 Summer Olympics, in the 1968 Summer Olympics, and in the 1972 Summer Olympics.
 He won a silver medal in the rapid fire pistol event at the 1972 Summer Olympics.
Lubomír Nácovský (26 May 1935 – 10 March 1982 in Kralupy nad Vltavou) was a Czech sport shooter who competed in the 1964 Summer Olympics and in the 1968 Summer Olympics.
 He won a bronze medal in the rapid fire pistol at the 1964 Summer Olympics.
Szilárd Kun (23 March 1935 – 31 August 1987) was a Hungarian sport shooter who competed in the 1952 Summer Olympics, in the 1956 Summer Olympics, in the 1964 Summer Olympics, in the 1968 Summer Olympics and in the 1972 Summer Olympics.
 He won a silver medal at the 1952 Games.
Timir Alekseevich Pinegin (Russian: Тимир Алексеевич Пинегин ; 12 June 1927 – 31 January 2013) was a Russian sailor who competed for the Soviet Union in the 1956 Summer Olympics, in the 1960 Summer Olympics, in the 1964 Summer Olympics, in the 1968 Summer Olympics, and in the 1972 Summer Olympics.
Peter Tallberg (15 July 1937 – 16 May 2015) was a Finnish sailor who competed in the 1960 Summer Olympics, in the 1964 Summer Olympics, in the 1968 Summer Olympics, in the 1972 Summer Olympics, and in the 1980 Summer Olympics.
The 4 × 400 metres relay or long relay is an athletics track event in which teams consist of four runners who each complete 400 metres or one lap.
 It is traditionally the final event of a track meet.
 At top class events, the first 500 metres is run in lanes.
 Start lines are thus staggered over a greater distance than in an individual 400 metres race; the runners then typically move to the inside of the track.

Question: What is the other name for this athletics track event in which Papa M'Baye N'Diaye competed at the 1964 Summer Olympics and the 1968 Summer Olympics?
Answer: long relay