A new variant of sphingomyelinase deficiency (Niemann-Pick): visceromegaly, minimal neurological lesion and low in vivo degradation rate of sphingomyelin. - Elleder,M.; Nevoral,J.; Špičácová,V.; Hyniová,H.; Kraus,J.; Krásný,J.; Vanier,M.T. (J Inherit Metab Dis, 1986)