Alison, "Microsoft Corp: Microsoft Mail for PC Networks 2.1", May 27, 1991; PC Week, P87(1). |
DEC, "E-Mail: Pacific Bell Connection Adds X.400 Directory Feature", Edge, Nov. 4, 1991, P38(1). |
J. Nielsen "The Art of Navigating through Hypertext" Communications Of The Association For Computing Machinery, vol. 33, No. 3, Mar. 1990, New York US pp. 296-310 XP000161627. |
M. Palaniappan & G. Fitzmaurice "InternetExpress: An Inter-Desktop Multimedia Data-Transfer Service" Computer, vol. 24, No. 10, Oct. 1991, Los Alamitos US pp. 58-67 XP000266116. |