Rogers, G. E.; Rothnagel, J. A. (1983). ”A sensitive assay for the enzyme activity in hair follicles and epidermis that catalyses the peptidyl-arginine-citrulline post-translational modification”. Current Problems in Dermatology 11: sid. 171–184. doi:10.1159/000408673. ISBN 978-3-8055-3752-0. PMID 6653155.
Crenn, P. (2000). ”Post-absorptive plasma citrulline concentration is a marker of intestinal failure in short bowel syndrome patients”. Gastroenterology 119 (6): sid. 1496–505. doi:10.1053/gast.2000.20227. PMID 11113071.
Rogers, G. E.; Rothnagel, J. A. (1983). ”A sensitive assay for the enzyme activity in hair follicles and epidermis that catalyses the peptidyl-arginine-citrulline post-translational modification”. Current Problems in Dermatology 11: sid. 171–184. doi:10.1159/000408673. ISBN 978-3-8055-3752-0. PMID 6653155.
Crenn, P. (2000). ”Post-absorptive plasma citrulline concentration is a marker of intestinal failure in short bowel syndrome patients”. Gastroenterology 119 (6): sid. 1496–505. doi:10.1053/gast.2000.20227. PMID 11113071.