Ochkin V.N. ,     Udalov Y.B. ,     Witteman W.J. ,     Peters P.J. ,     Heeman-ilieva M.B. ,     Ilukhin B.I. ,     Kochetov I.V. Theoretical and experimental investigation of a waveguide CO_2 laser with radiofrequency excitation. Appl.Phys. , Vol.62B, , с. P.113-127 , 01.1996   Ochkin V.N. ,     Udalov Y.B. ,     Tskhai S.N. ,     Witteman W.J. ,     Peters P.J. ,     Ilukhin B.I. ,     Kochetov I.V. Influence of the electric field frequency on the performance of a RF excited CO_2 waveguide laser. Appl.Phys. , Vol.63B , с. C.575-583 , 01.1996