References
Hall, Marshall, Jr.: Projective planes. Trans. Amer. Math. Soc.54, 229–277 (1943).
Kopejkina, L. I.: Decomposition of projective planes. Izvestija Akad. Nauk, SSSR, Ser. Mat.9, 495–526 (1945).
Pickert, G.: Projektive Ebenen. Berlin-Göttingen-Heidelberg: Springer 1955.
Sandler, Reuben: The collineation groups of free planes. Trans. Amer. Math. Soc.107, 129–139 (1963).
—: Some theorems on the automorphism groups of planar ternary rings. Proc. Amer. Math. Soc.15, 984–987 (1964).
—: The collineation groups of free planes II. A presentation for the groupG 2. Proc. Amer. Math. Soc.16, 181–186 (1965).
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Partially supported by NSF Grant Number NSF GP 6539.
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Sandler, R. On free extensions of rank 1. Math Z 111, 233–248 (1969). https://doi.org/10.1007/BF01113289
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DOI: https://doi.org/10.1007/BF01113289