00556nam a2200157Ia 4500003000900000008004100009040001600050080001700066100002100083245010600104260004800210300001300258490006800271650002400339650003500363IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a517.944bJEF  aJeffreys, Harold 0aOperational methods in mathematical physicscHarold Jeffreys                                           aCambridgebCambridge University Pressc1927  avi, 99p.  aCambridge tracts in mathematics and mathematical physics; v. 23  aOperations Research  aPartial Differential Equations