Sovik, O., de Barsy, T., & Maehle, B. (1982). Phosphorylase-kinase Deficiency - Severe Glycogen-storage Disease With Evidence of Autosomal Recessive Mode of Inheritance. European Journal of Pediatrics, 139(3), 210. https://doi.org/10.1007/BF01377363 (Original work published 1982)