1. Crossman, A.R. (2008) Overview of the nervous system. In: Standring S (ed) Gray's anatomy. 40th ed, Philadelphia, Churchill Livingstone Elsevier, pp. 225-236.
2. DeBroff, B.M. & Spierings, E.L.H. (1990) Migraine associated with periorbital ecchymosis. Headache, 30, 260-263.
3. Faure, C. & Wieckowska, A. (2007) Somatic referral of visceral sensation and rectal sensory threshold for pain in children with functional gastrointestinal disorders. J. Pediatr., 150, 66-71.
4. Headache Classification Subcommittee of the International Headache Society. (2004) The International Classification of Headache Disorders, Second Edition. Cephalalgia, 24 (Suppl 1), 1-160.
5. Lim, D.C.E., Cheng, L.N.C. & Wong, F.W.S. (2009) Could it be Henoch-Schonlein purpura? Aust. Fam. Physician, 38, 321-324.