Citation: Th. Nelson, Xanalogical structure, needed now more than ever: Parallel documents, deeplinks to content, deep versioning, and deep re-use, ACM C SURV, 31, 1999, pp. NIL_194-NIL_225
Citation: J. Hromkovic, Some contributions of the study of abstract communication complexity to other areas of computer science, ACM C SURV, 31, 1999, pp. F1-F5