American Radio Relay League (ARRL)
Peter McIan
William F. Egan
Vadim Manassewitsch
James A. Crawford
Ulrich L. Rohde
Archie Frederick Collins
Kroupa, Věnceslav F.
Hamid R. Rategh
Jerzy Gorski-Popiel
Cosmin Radu Popa
Věnceslav F. Kroupa
Andrea Leonardo Lacaita
Unknown Author
David Naumovich Shapiro
Alexander Chenakin
International Conference on Frequency Control and Synthesis (2nd 1989 University of Leicester)