Don Coppersmith, James B. Shearer
Electronic Journal of Combinatorics
An animal A is a set of unit squares in the plane, parallel to the axes, and with corners at integer lattice points. We show that any animal A with four cells tiles the plane, in the sense that infinitely many copies of A, translated by integer vectors and possibly rotated through 90°, 180°, or 270°, can be placed so as to fill plane exactly without overlap. © 1985.
Don Coppersmith, James B. Shearer
Electronic Journal of Combinatorics
Don Coppersmith, Prabhakar Raghavan, et al.
Information and Computation
Nikhil Bansal, Don Coppersmith, et al.
SODA 2006
Don Coppersmith, Chai Wah Wu
Statistics and Probability Letters