Geodesic
Slender partial quadrangles and their automorphisms
Algebra i logika, Tome 45 (2006) no. 5, pp. 603-619.

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The partial quadrangle $PQ(s,t,\mu)$ is an incidence system consisting of points and lines in which every line contains $s+1$ points, every point sits on $t+1$ lines (two lines meet in at most one point), and the meet of the neighborhoods of any two non-adjacent points in the collinearity graph is a $\mu$-coclique. We provide a classification for partial quadrangles $PQ(s,t,\mu)$ with $t\leqslant 6$, and study into their automorphisms.
Keywords: partial quadrangle, incidence system
Mots-clés : automorphism. 
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A. A. Makhnev; M. S. Nirova. Slender partial quadrangles and their automorphisms. Algebra i logika, Tome 45 (2006) no. 5, pp. 603-619. http://geodesic.mathdoc.fr/item/AL_2006_45_5_a4/

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