TY - BOOK AU - Gould, Sydney H. (Sydney Henry) TI - Variational methods for eigenvalue problems : an introduction to the methods of Rayleigh, Ritz, Weinstein, and Aronszajn PB - University of Toronto Press PY - 1957 T2 - Mathematical expositions VL - no. 10 EP - xiv, 179 p. UR - https://ci.nii.ac.jp/ncid/BA05971408 ER -