Clement W. H. Lam Larry H. Thiel Stan Swiercz John McKay The nonexistence of ovals in a projective plane of order 10. 319-321 1983 45 Discrete Mathematics 2-3 http://dx.doi.org/10.1016/0012-365X(83)90049-3 db/journals/dm/dm45.html#LamTSM83