Sphingolipid activator protein deficiency in a 16-week-old atypical Gaucher disease patient and his fetal sibling: biochemical signs of combined sphingolipidoses. - Harzer,K.; Paton,B.C.; Poulos,A.; Kustermann-Kuhn,B.; Roggendorf,W.; Grisar,T.; Popp,M. (Eur J Pediatr, 1989)