000
002710000a22001090004500
245
_a
Relays and protection : procedings of a conference
100
_a
Helmut, Ungrad
500
_a
various paging; mimeographed
080
_a
621.316.9
_b
H4
041
_a
EN
942
_c
BK
999
_c
102921
_d
102921