000
00253nam a2200109 4500
008
160616s 000 0
245
_a
Equations of the mixed type
100
_a
Bitsadze,A>V
500
_a
B334 K4
942
_c
BK
_2
BK3774
080
_a
517.95 BIT
999
_c
3774
_d
3774