@article{SEMR_2013_10_a15,
     author = {Andrei V. Zavarnitsine},
     title = {Subextensions for a permutation $\mathrm{PSL}_2(q)$-module},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {551--557},
     publisher = {mathdoc},
     volume = {10},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2013_10_a15/}
}