00550nam a2200169 a 450000500170000002000180001708200180003510000200005324500860007326000440015930000210020369000190022496400260024399700190026999900190028895200730030720251203111553.0  a9780486450780  a515.3523bLAV  aLavrent'ev, M.A  aVariational methods for boundary value problems for systems of elliptic equations  aNew YorkbDover Publications, Incc1989  a153p.c22cm.bHB  aBoundary value  bENGLISHcd515efg_  a160881 LIBSC C  c130642d130642  00104070aPUbPUd2010-03-12g1649.00l0o515.3523 LAVp160881yBK