MODULATIONAL INSTABILITY OF LANGMUIR OSCILLATIONS IN THE FIELD OF AN ELECTROMAGNETIC WAVE I.A. Kol'chugina, A.G. Litvak, T.N. Fedoseeva and G.M. Fraiman. J. Phys. Colloques, 40 C7 (1979) C7-629-C7-630 DOI: 10.1051/jphyscol:19797305