00506nam a22001817a 450000500170000002000220001704100080003908200230004710000160007024500670008625000170015326000410017030000240021165000250023570000190026070000160027985600290029520260624154807.0  a978-93-528-3722-9  aeng  223rd.a530.15bDAS  aDass, H. K.  aMathematical physicscH. K. Dass, Rajnish Verma and Rama Verma  a8th rev. ed.  aNew DelhibS. Chand Publishingc2026  axxiv,1416p.;c23cm.  aMathematical physics  aVerma, Rajnish  aVerma, Rama  uwww.schandpublishing.com