found: Work cat.: The tyranny of the two-party system, c2002.
found: A republic of parties? : debating the two-party system, c1998.
found: Dictionary of the social sciences, 2002:(party systems: Blondel has defined two-party systems as those in which two major parties together gain 90 percent or more of the popular vote)
found: The Concise Oxford dictionary of politics, 2003:(two-party systems: political systems in which only two political parties effectively compete for government office)
found: American political parties, 1991:p. 78 (durability of the two-party system in America; Democrats and Republicans currently exercise a virtual duopoly over electoral office)
found: Google search, Apr. 8, 2008(two-party systems; dual-party systems)
