Don Coppersmith
IEEE Trans. Inf. Theory
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
IEEE Trans. Inf. Theory
Don Coppersmith, Chai Wah Wu
Statistics and Probability Letters
Don Coppersmith, Alan J. Hoffman
Linear Algebra and Its Applications
Zeev Barzilai, Don Coppersmith, et al.
IEEE TC