F. Cannemeijer, M.H. de Vasconcelos and A.E. de Vries, Measurement of vibrational relaxation times in the spectrophone by the amplitude-frequency response method, Physica 53, 77-97 (1971)
M.H. de Vasconcelos, F. Cannemeijer and A.E. de Vries, The choice of a calibration gas for CH4 spectrophone measurements: NH3 or a small amount of C2H6 in CH4, Chem. Phys. Lett. 12, 154-156 (1971)
J.F.M. Aarts and F.J. de Heer, Emission cross sections for 0 I and 0 II multiplet radiation produced by electron impact on O2, Physica 56, 294-296 (1971)