1. Multisets: Collection containing indistinguishable elements, discrete and combinatorial physics;Blizard,1987
2. Multiset theory, Notre Dame;Blizard;J. Formal Logic,1989
3. A theory of shadows (An informal discussion of negative membership), ANPA WEST;Blizard;J. Western Regional Chapter of the Alternative Natural Philosophy Association,1989
4. Negative membership, Notre Dame;Blizard;J. Formal Logic,1990
5. The Development of Multiset Theory;Blizard;Modern Logic,1991