by V. V. Kozlov, A. T. Fomenko, Moskovskiĭ gosudarstvennyĭ universitet im. M.V. Lomonosova. Mekhaniko-matematicheskiĭ fakulʹtet, Tematicheskai︠a︡ konferent︠s︡ii︠a︡ "Geometrii︠a︡, differentsialʹnye uravnenii︠a︡ i mekhanika"