000 00267nam a22000857a 4500
008 210303b ||||| |||| 00| 0 eng d
050 _aQC721
245 _a Variational principles in the theory of collisions
_cDEMKOV, YU N.
942 _2lcc
_hQC721 .D46 1963
999 _c1383
_d1383