00303nam a2200121Ia 4500082002100000100002300021245004100044260003300085300000600118490004700124500000500171700000500176  a515.35bAz995.LS  aAziz, A. K. d ed.  aLectures in differential equationsb  aNew YorkbVan Nostrandc1969  a   aVan Nostrand Mathematical studiesv 18, 19  a  a