00254nam a2200109 a 450000500170000008200190001710000160003624500350005225000110008726000280009830000180012620251203091511.0  a515.8,bD, osg  aOsgood, W.F  aLehrbuch der funktionen theory  a2nd ed  aNew YorkbChelseac1932  axiv,68p, 22cm