The Economics of Segregated and Integrated Systems in Data Communication with Geometrically Distributed Message Lengths. - P. K. Verma; A. M. Rybczynski (IEEE Trans. Commun., 1974)

Datapac X.25 service characteristics. - A. M. Rybczynski; D. F. Weir (SIGCOMM, 1977)

Alternatives for providing highly reliable access to X.25 networks. - Richard J. Chung; A. M. Rybczynski (MARK, 1979)

Interworking Between Packet Networks and Integrated Voice/Data Access Systems. - A. M. Rybczynski; G. I. Spechman; L. S. Kayser (ICC (3), 1984)