00307nam a2200109Ia 4500003000400000008004100004040000800045100002000053245008000073260003400153300001000187LDD181029s9999    xx            000 0 und d  cLDD  aMurphy, Raymond 0aSocial closurebthe theory of monopolization and exclusion.cRaymond Murphy  aOxfordbClarendon Pressc1988  a276p.