Symmetric Gobos in a Finite Projective Plane. - George E. Martin (J. Comb. Theory A, 1971)

Tetramorphic and Pentamorphic Prototiles. - Anne Fontaine; George E. Martin (J. Comb. Theory A, 1983)

Polymorphic Prototiles. - Anne Fontaine; George E. Martin (J. Comb. Theory A, 1983)

An Enneamorphic Prototile. - Anne Fontaine; George E. Martin (J. Comb. Theory A, 1984)