00552nam a2200181Ia 4500082002100000100001600021245006400037260002600101300002300127500005700150500000500207690000600212700000500218952010300223964001700326921001000343999001700353  a515.35bSa129.BE  aSagan, Hans  aBoundary and eigen value problems in mathematical physicsb  aNew YorkbDoverc1989  axviii, 381p. Index  a"Originally published in 1961 by John Wiley & sons".  a  a   a  00104070aISIbISId1998-09-28l0o515.35 Sa129.BEpDP22074r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a14461  c14461d14461