Vakulenko S. А. RussiaSaint Petersburg Institute of Problems of Mechanical Engineering of Russian Academy of Science, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia ведущий научный сотрудникдоктор физико-математических наукvakulenfr@mail.ru Author's articles NEW TYPE OF BIFURCATIONS IN THE MODIFIED RAYLEIGH–BENARD ´ CONVECTION PROBLEM