Dunlop, John. Digital Mobile Communications and the TETRA System John, Dunlop, Demessie, Girma & James, Irvine. - New York : John Wiley & Sons, Ltd, c1999. - xxvii, 436p.: ill.; Following book also have Appendix from pg.no. 413 to 425 ISBN: 0471987921 Dewey Class. No.: 621.38450218 / DUN/DIG