000 00300nam a2200133Ia 4500
008 211209s1975 xx 000 0 und d
020 _a9789332550131
041 _aeng
100 _aVALKENBURG ME VAN
245 _aNETWORK ANALYSIS
250 _a3RD ed.
260 _bPEARSON
_c1975
300 _a571
999 _c89174
_d89174