This web page lists the references in my paper:

"Barring the Z-Pentomino from the Infinite Checkerboard", Studies in Applied Mathematics, 67(1982), p. 73-77.

• F. W. Barnes and J. B. Shearer, "Barring Rectangles from the Plane", Journal of Combinatorial Theory Series A, 33(1982), p. 9-29.
• S. W. Golomb, Polyominoes, pp. 42-55, Scribner's, New York, 1965.
• M. S. Klamkin and A. Liu, "Polyominoes on the Infinite Checkerboard", J. Combin. Theory Ser. A, 28(1980), 7-16.
• D. J. Kleitman and F. Lasaga, personal communication.