Tim Penttila. One-point extensions of finite inversive planes. Australasian J. Combinatorics, 8:53-54, 1993. [doi]
@article{Penttila93, title = {One-point extensions of finite inversive planes}, author = {Tim Penttila}, year = {1993}, url = {http://ajc.maths.uq.edu.au/pdf/8/ocr-ajc-v8-p53.pdf}, researchr = {https://researchr.org/publication/Penttila93}, cites = {0}, citedby = {0}, journal = {Australasian J. Combinatorics}, volume = {8}, pages = {53-54}, }