CNRE publications https://orfeo.belnet.be/handle/internal/7946 2026-05-07T11:53:19Z Portrait de Sydney Chapman https://orfeo.belnet.be/handle/internal/13420 Portrait de Sydney Chapman Nicolet, M. Photochimie aéronomique https://orfeo.belnet.be/handle/internal/13419 Photochimie aéronomique Nicolet, M. The aeronomic problem of neutral helium and hydrogen https://orfeo.belnet.be/handle/internal/13410 The aeronomic problem of neutral helium and hydrogen Nicolet, M.; Kockarts, G. Theories on electron production an recombination in the D and E layers https://orfeo.belnet.be/handle/internal/13409 Theories on electron production an recombination in the D and E layers Nicolet, M.