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Scotto, Thomas J.; Stephenson, Laura B.; Kornberg, Allan (2004-09-01). "From a two-party-plus to a one-party-plus? Ideology, vote choice, and prospects for a competitive party system in Canada". Electoral Studies. 23 (3): 463–483. doi:10.1016/S0261-3794(03)00054-4. ISSN0261-3794.