00536nam a2200193 a 450000500170000002000180001708200200003510000230005524500440007826000480012230000250017049000550019560000080025063000230025863000220028163000270030385600060033085600060033620251203112344.0  a9780521177399  a530.155353bMIL  aMiller, Willardd_  aSymmetry and separation of variablesb_  aCambridgebCambridge University Pressc2012  axxx,285p.c22cm.bPB  aEncuclopedia of mathematics and its applications 4  bc_  aSymmetry (physics)  afunctions special  adifferential eduations  f_  a_