00446nam a2200145 a 450000500170000002000150001708200170003210000210004924500610007026000540013130000240018549000490020970000180025870000240027620251203111211.0  a0821808966  a530.155bLAV  aLavrent'ev, M.M.  aIII- Posed Problems of Mathematical Physics and Analysis  aRhode IslandbAmerican Mathematical Societyc1986  avi,290p.c25cm.cPB  aTranslation of mathematical monogrphs Vol.64  aRomanov, V.G.  aShishat.Skill, S.P.