TY JOUR TI Application of the entropy approach to assess the survivability of network routes messages KW entropy approach KW the rate of survival of an undirected graph JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Averyanov, V.T. AU Topilkin, E.S. PY 2012 IS 2012 PB Saint-Petersburg University of State Fire Service of Emercom of Russia