1. The Reliability of Telephone Traffic Load Measurements by Switch Counts;Hayward;Bell System Tech. J.,1952
2. Accuracy of Measurements in Determining Traffic Volumes by the Scanning Method;Palm;Tekniska Medelanden fran Kungl. Telegrafstyrelsen,1941
3. Transition Probabilities for Telephone Traffic;Beneš;Bell System Tech. J.,1960
4. Over de invloed van herhaalde oproepen in de theorie der blokkerings-kansen;osten;Ingenieur (Utrecht),1947
5. Telephone Traffic Time Averages;Riordan;Bell System Tech. J.,1951