TY - BOOK AU - Hunter,jane m AU - Thiebaud,Maud E TI - Telecommunications Billing Systems: Implementing and Upgrading for profitability SN - 0071408576 U1 - 001.6425 ed21 PY - 2003/// CY - New York PB - McGraw-Hill KW - Computers N1 - Accompanying Matrials CD ER -