000 00400nam a2200145Ia 4500
008 230917s9999||||xx |||||||||||||| ||und||
040 _e22074
_aMAIN
041 _aEnglish
082 _a510 B417P
100 _aBellman, Richard
245 0 _aPerturbation techniques in mathematics, physics and engineering
260 _aNew York
_bDover Publications
_c1972
300 _aviii, 118 p.
942 _cBK
999 _c185015
_d185015