00345nam a2200145   450000100060000000300030000600500170000900800410002603500190006703500180008605000200010410000160012424500380014026000210017820256UR20220427164826.0061103|||||||||||||||||||||||||||||||| d  a(janium) 20245  a(janium)20244 4aQC20b.B82 19841 aBudak, B.M.10aProblemas de la fisica matematica  bMir  Moscuc1984