@misc{IVP_2019_27_4_a6,
     title = {To the memory of {D.} {A.} {Usanov} (1943 {\textendash} 2019)},
     journal = {Izvestiya VUZ. Applied Nonlinear Dynamics},
     pages = {114--116},
     publisher = {mathdoc},
     volume = {27},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVP_2019_27_4_a6/}
}