Reference:
Petteri Kaski. Nonexistence of perfect Steiner triple systems of orders 19 and 21. Bayreuther Mathematische Schriften, 74:130–135, 2005. Proceedings of ALCOMA05, April 3–10, Thurnau, Germany.
Suggested BibTeX entry:
@article{Kaski05b,
author = {Petteri Kaski},
journal = {Bayreuther Mathematische Schriften},
note = {Proceedings of {ALCOMA05}, {A}pril 3--10, {T}hurnau, {G}ermany},
pages = {130--135},
title = {Nonexistence of perfect {S}teiner triple systems of orders 19 and 21},
volume = {74},
year = {2005},
}
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