Symmetries in the families of rectangular solutions.

At the Combinatorial Object Server.

A container of mathematical games, gadgets and software. (English/Italian)

Problems on minimal covers.

Some packings of the 108 heptominoes (with unit thickness) into various blocks.

Undergraduate Research Project in Random Tilings.

Alex Selby's page with a description of his solution method, with illustrations in .png and .pdf files.

Polyominoes, polycubes and polyspheres.

Home Page of the inventor of polyominoes. Includes biography, black and white picture, research interests and publications list.

Fast Pentominos puzzle solver, works on DOS/Windows platform. Free downloads.