000
00271nam a2200109 4500
008
160616s 000 0
245
_a
Introduction to perturbation techniques
100
_a
Nayfeh, Ali Hasan
500
_a
B281 M14
942
_c
BK
_2
BK6269
080
_a
519.21 NAY
999
_c
6269
_d
6269