00355nam a2200109Ia 4500008004100000082002000041100002100061245003200082260005200114300001600166440006300182260910b        |||||||| |||| 00| 0 eng d  a515.24bL665.GA  aLevinson, Norman  aGAP and density theoremsb/  aNew York:bAmerican Mathematical Society,c1968  aviii, 246p.  aAmerican Mathematical Society Colloquium Publications ; 26