Geodesic
The automorphism groups of Steiner triple systems obtained by the Bose construction
Journal of Algebraic Combinatorics, Tome 18 (2003) no. 3, pp. 159-170.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: The automorphism group of the Steiner triple system of order $vequiv$ 3 (mod 6), obtained from the Bose construction using any Abelian Group $G$ of order $2 s + 1$, is determined. The main result is that if $G$ is not isomorphic to $Z _{3} ^{ n } \times Z _{9} ^{ m }, nge$ 0, $mge$ 0, the full automorphism group is isomorphic to $Hol( G) \times Z _{3}$, where $Hol( G)$ is the Holomorph of $G$. If $G$ is isomorphic to $Z _{3} ^{ n } \times Z _{9} ^{ m }$, further automorphisms occur, and these are described in full.
Keywords: Steiner triple system, Bose construction, automorphism 
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     title = {The automorphism groups of {Steiner} triple systems obtained by the {Bose} construction},
     journal = {Journal of Algebraic Combinatorics},
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Lovegrove, G. J. The automorphism groups of Steiner triple systems obtained by the Bose construction. Journal of Algebraic Combinatorics, Tome 18 (2003) no. 3, pp. 159-170. http://geodesic.mathdoc.fr/item/JAC_2003__18_3_a5/