References
- ALEXANUKH , V. D. , 1975 , The Fully Optimised Keyphone , Post Office Research Department Report No. 501 .
- COPPING , B. , 1975 , Keying Versus Dialling A Review, Including an Additional Experiment Using Residential Customers , Post Office Research Department Report No. 500 .
- HAYWAKD , W. S. , and WILKINSON , R. I. , 1970 , Human Factors in Telephone Systems , a paper at the 6th International Teletraffic Conference , Munich .
- MANTEL , H. , and WOZNY , H. , 1968 , Abbreviated Dialling and its Probable Efficacy, Derived From Records of Telephone Users , a paper at the 4th International Symposium on Hitman Factors in Telephony. Bad Wiessee. Germany .