00258nam a2200109Ia 4500008004100000041000800041082002500049100001500074245004200089260000900131300000800140211209s1973    xx            000 0 und d  aeng  a301.240 151 N 73 ROB  aROBERT L H  aMATHEMATICAL THEORY OF SOCIAL CHANGE   c1973  a237