Geodesic
On Finite Line Transitive Affine Planes Whose Collineation Groups Contain no Baer Involutions
Canadian journal of mathematics, Tome 27 (1975) no. 2, pp. 225-230

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A finite line transitive affine plane A is a finite plane which admits a collineation group G acting transitively on the set of all lines of A. Wagner [11] has shown that A is a translation plane and Hering [9] recently investigated the structure of A under the assumption that G has a composition factor isomorphic to a given nonabelian simple group. The purpose of this paper is to show that if the number of points on a line of A is odd, and if G contains no Baer involutions, then the hypothesis of Hering's Main Theorem holds. 
Czerwinski, Terry. On Finite Line Transitive Affine Planes Whose Collineation Groups Contain no Baer Involutions. Canadian journal of mathematics, Tome 27 (1975) no. 2, pp. 225-230. doi: 10.4153/CJM-1975-027-0
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