Robert W. Fathauer
Some Common Themes in Visual Mathematical Art
Diego Uribe
A set of impossible tiles
Corinne Cerf
A family of impossible figures studied by knot theory
Tamás Farkas and Péter
Érdi
'Impossible' forms: Experimental Graphics and Theoretical Associations
Chih W. Khoh and Peter
Kovesi
Animating Impossible Objects
Donald E. Simanek
The principles of artistic illusions
M.C. Escher Biography
Mathematical art of M. C. Escher
Sara Robinson
M.C. Escher: More Mathematics Than Meets The Eye
Impossible figures in the real world
