Question: In the 1990's which corporation owned the company which published the novels of Judith Duncan ?

Context paragraphs:
Energy Development Corporation: Energy Development Corporation (or simply EDC) is the largest producer of geothermal energy in the Philippines and the second largest in the world.  It is involved in geothermal, hydroelectric and wind energy projects.  The company was formerly owned by the Philippine National Oil Company, a state corporation owned by the Republic of the Philippines engaged in the exploration of resources, production of energy and distribution of power supply to smaller electricity distributor.  EDC was privatized and acquired by the Lopez Group as part of its energy and power supply utility business units.

Judith Duncan: Judith Duncan is a popular author of romance novels published primarily by Harlequin Enterprises between 1983 and 2002.  During the period when Duncan was actively publishing, she lived and worked in Alberta, Canada.  She based many of her books in this region.  She has been heavily involved in local writers groups in a variety of roles.  In particular, she has been active in the organisation and running courses designed to develop writing and publishing skills.

Saskatchewan Grain Car Corporation: Saskatchewan Grain Car Corporation (reporting marks SKPX, SKNX) is a Canadian crown corporation owned by the Government of Saskatchewan established on October 2, 1979 to purchase and rent grain rail cars for the transportation of statutory grains between Saskatchewan and export ports.  The board of directors is currently composed of Dave Marit and Lyle Stewart.  The corporation is governed by the Saskatchewan Grain Car Corporation Act.  In 1990 the government investment $55M in the corporation for the purchase of 1,000 new covered rail cars.  Priority in the rental of rail cars is given to short-line operators in the province

Hunt Petroleum: Hunt Petroleum Corporation was an oil and gas exploration and production company formed in 1950.  The company was originally called Petrol Production Co. and was later renamed Hunt Petroleum Corporation.  The company was a Delaware corporation owned 52.84% by the Margaret Hunt Trust Estate and 47.16% by the Haroldson L. Hunt, Jr.  Trust Estate.  The primary beneficiaries of these two trusts are the two eldest children of the late H. L. Hunt and Lyda Bunker Hunt.  Hunt Petroleum Corporation had no common ownership and was not affiliated with any of the following entities: Hunt Oil Company; Petro-Hunt, LLC; Hunt Exploration; Unity Hunt; Hunt Properties; or Rosewood Resources.

Synergy (electricity corporation): Synergy is a corporation owned by the Government of Western Australia.  Synergy, Verve Energy, Horizon Power and Western Power were created in 2006 as a result of the breakup (disaggregation) of Western Power Corporation.  With effect from 1 January 2014 the retailer (Synergy) merged with the state-owned generation business (Verve Energy).  That new company is also called Synergy.  The corporation's official legal name is the "Electricity Generation and Retail Corporation".  Synergy is Western Australia’s largest energy retailer and generator with more than one million industrial, commercial and residential customers, generating total annual revenue of more than $3.2 billion (14/15 financial year).

Valhi, Inc.: Valhi, Inc. is an American holding company operating through wholly and majority-owned subsidiaries in a number of different industries.  It was founded in 1987 as a result of the merger of the LLC Corporation and a company controlled by the Contran Corporation.  The Contran Corporation owned 93% of Valhi's common stock as of December 2014.

Detroit Aircraft Corporation: The Detroit Aircraft Corporation was incorporated in Detroit, Michigan on July 10, 1922, as the Aircraft Development Corporation.  The name was changed in 1929.  The Detroit corporation owned the entire capital stock of the Ryan Aircraft Corp., Aircraft Development Corp., Aviation Tool Co., Grosse Ile Airport, Inc., Marine Aircraft Corp., Park's Air College and Affiliated Companies, Detroit Aircraft Export Co., Gliders, Inc., and Eastman Aircraft Corp.  It also owned a 90% interest in the Blackburn Aeroplane and Motor Company, practically all of the capital stock of the Lockheed Aircraft Company and a 40% interest in Winton Aviation Engine Co.  During the Great Depression the Detroit Aircraft holding company found that rising losses from other operations were draining the company coffers.  On October 27, 1931, the Detroit Aircraft Corporation went into receivership.

Harlequin Enterprises: Harlequin Enterprises Limited (known simply as "Harlequin") is a Toronto-based company that publishes series romance and women's fiction.  Harlequin was owned by the Torstar Corporation, the largest newspaper publisher in Canada, from 1981 to 2014.  It was then purchased by News Corp and is now a division of HarperCollins.

David Radler: F. David Radler (born 1944 in Montreal, Quebec) is a Canadian executive and close associate of Conrad Black for 36 years.  Radler was once president of Ravelston Corporation, a privately owned corporation owned by Black and Radler to control their former newspaper empire.  Ravelston owned Argus Corporation which in turn controlled Chicago-based Hollinger International.  In 2005 14.1% of Ravelston was owned by Radler.

FRHI Hotels &amp; Resorts: FRHI Hotels & Resorts is a Toronto, Ontario, Canada based hotel management company owned by AccorHotels.  FRHI is the parent company that manages three brands of hotels including Fairmont, Raffles, and Swissôtel.  These hotel chains together include over 100 hotels and resorts in 30 countries worldwide.  The company also owned Delta Hotels at one point but sold the hotel management company in October 2007 to bcIMC, a Crown corporation owned by the Government of British Columbia.  In 2015, Delta Hotels was purchased by Marriott International.

Supporting paragraphs: Judith Duncan Harlequin Enterprises
Answer: the Torstar Corporation