00274nam a2200097Ia 4500008004100000082003000041100002200071245003600093260003900129300000800168140113s9999    xx            000 0 und d  a574/577.001.5(082.2)   L2  a"Benke, John. A."  aChallanging biological problems  a1972bOxford Univ. PresscNew York  a502