00684nas 2200241 450 00000461820080609114839.00360-030020030404a1971----km-y0itay50------baengUSahaz---0uu-ACM computing surveysAssociation for Computing MachineryNew-YorkAssociation for Computing Machinery1971-fascicoliTrimestraleInformaticaAssociation for Computing MachineryITUNIPARTHENOPERICAUNIMARC0000046182003-2006PISTACM computing surveys104605UNIPARTHENOPE