SMS dit: Libraries and Electronic Publishing Promises and Challenges for the 90's. Festschrift in Honor of Richard M. Dougherty. Proceedings of the International Essen Symposium (14th, Essen, Germany, October 14-17, 1991). Publications of Essen University Library, 14 / Ahmed H. Helal, Ed. and Joachim W. Weiss, Ed. [microform] :