共 8 条
[1]
CROCKER A, 1973, SERL TECH J, V23, P2
[3]
HELM H, 1972, Z NATURFORSCH A, VA 27, P1812
[5]
SMITH PR, 1973, DNA00172C0238 CONTR
[6]
Spangenberg KR, 1948, VACUUM TUBES
[7]
SULLIVAN HG, 1973, MAY IEEEOSA C LAS EN
[8]
TRUMP JG, 1971, Patent No. 3588565