00373nam a22001337a 450000500170000000800410001702000080005804100080006608200180007410000230009224500710011526000380018630000150022420260710163633.0260710b        |||||||| |||| 00| 0 eng d  a000  aeng  a530.15bSOM/P  aSommerfeld, Arnold  aPartial Differential Equations In Physicsc/ by Arnold Sommerfeld   aNew York:bAcademic Press,c1949.  axi, 335p.;