Smith E.W., J. Cooper, and C.R. Vidal, Ixth Conference On Ionization Phenomena In GasesProceedings IXth Conference on Ionization Phenomena in Gases, 591(1969).
Smith E.W., C.R. Vidal, and J. Cooper, Ixth Conference On Ionization Phenomena In GasesProceedings IXth Conference on Ionization Phenomena in Gases, 592(1969).