Neurological mutations affecting myelination : research tools in neurobiology, correlations to human neurological diseases : proceedings of the International Symposium on Neurological Mutations Affecting Myelination, research tools in neurobiology, correlations to human neurological diseases, held in Seillac (France), 13-17 April 1980 / sponsored by the Institut national de la santé et de la recherche médicale, the European Molecular Biology organization, and the European Society for neurochemistry ; editor, Nicole Baumann