The design of the century Anthony D. Forbes; Mike J. Grannell; Terry S. Griggs — 2007 Mathematica Slovaca
Properties of the Steiner triple systems of order 19. Colbourn, Charles J.; Forbes, Anthony D.; Grannell, Mike J.; Griggs, Terry S.; Kaski, Petteri; Östergård, Patric R.J.; Pike, David A.; Pottonen, Olli — 2010 The Electronic Journal of Combinatorics [electronic only]