"A Sophisticated Switched Service" (Katz et al.) and Modifying No. 1 ESS for Enhanced Private Network Service (Anderson et al.), Bell Laboratories Record, Feb. 1979, pp. 38-52. |
"Expanding the Role of Private Switching Systems", Bush et al., Bell Laboratories Record, Oct. 1979, pp. 243-248. |
"GTE Private Interconnect Networks, Systems and Solutions",(3 papers), Nat'l Telecom. Conf., New Orleans, Nov. 1981. |
"Railroad Firm Reroutes Long Distance Calls with an Efficient, Integrated Network", Telephony, Mar. 7, 1983, pp. 32, 33, 36. |