:On-line library and network systems : symposium held at Dortmund university, march 22-24, 1976, organized by E. Edelhoff, W. Lingenbert, G. Pflug, V. Wehefritz. Edited by E. Edelhoff and K. D. Lehmann. Frankfurt am Main : Klostermann, 1977. 167 s. [Copy count : 1, currently available 1, at library only 0]