000 00392nam a2200181 4500
020 _a
_c
082 _aBV BST 1970.40(10)
100 _a
245 _aBell system technical journal, 1970, Vol.49, No.10
250 _a
260 _aBell System
_c1970
300 _a3019
490 _a
500 _a
590 _aVMV
_b
_c
650 _aBell system technical journal
942 _cBK
999 _c476354
_d476354