*Colbourn, Charles J.; Dinitz, Jeffrey H. (2007) "Handbook of Combinatorial Designs", Boca Raton, Florida: Chapman and Hall/CRC Press, ISBN 1-58488-506-8.
* Colbourn, Charles J.; Dinitz, Jeffrey H. (2007) "Handbook of Combinatorial Designs", Boca Raton, Florida: Chapman and Hall/CRC Press, ISBN 1-58488-506-8.