00341nam a2200121Ia 4500082002000000100002500020245005800045260003600103300002700139490004300166500000500209700000500214  a515.35bR359.ST  aReid, William Thomas  aSturmian theory for ordinary differential equationsb  aNew YorkbSpringer-Verlagc1980  axv, 559p. Index, Bibl.  aApplied Mathematical Sciences v v. 31  a  a