00361nam a2200121Ia 4500082001900000100004000019245003800059260002700097300001500124490006500139500000500204700003000209  a515.7bL972.EF  aLusternik, L. A. and Sobolev, V. J.  aElements of functional analysisb  aDelhibHindustanc1974  axvi, 360p.  aInternational monographs on Advanced Mathematics and Physics  a  aSobolev, V. J.; jt. auth.