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040 _aDIBRA
_bspa
_cUVAL
_erda
041 0 _aeng
082 0 _a519.11
100 1 _aGould, S.,
_eautor.
245 0 0 _aVariational methods for eigenvalue problems :
_ban introduction to the Weinstein method of intermediate problems /
_S. Gould.
264 1 _aLondon :
_bUniversity of Toronto Press,
_c1957.
300 _a275 páginas.
338 _nc
490 1 _aMathematical expositions ;
_vnumero 10
650 0 _aESTADISTICA MATEMATICA.
942 _cBK
_2ddc
999 _c6946
_d6946