ISDN : an introduction
Stallings, William
ISDN : an introduction by William Stallings - New York Macmillan 1989 - xii. 420p.
002946028X
621.382 / N891;3
ISDN : an introduction by William Stallings - New York Macmillan 1989 - xii. 420p.
002946028X
621.382 / N891;3