The nonexistence of projective planes of order 12 with a collineation group of order 9.

Kenzi Akiyama Chihiro Suetake Masaki Tanaka The nonexistence of projective planes of order 12 with a collineation group of order 9. 112-160 2019 74 Australas. J Comb. http://ajc.maths.uq.edu.au/pdf/74/ajc_v74_p112.pdf db/journals/ajc/ajc74.html#AkiyamaST19