1. The porphyrias;Kappas,1989
2. Prognosis of acute porphyria: occurrence of acute attacks, precipitating factors and associated diseases;Kaupplnen;Medicine (Baltimore),1992
3. Waldenstrom J, In: Moore MR, McColl KEL, Rimington C, Goldberg Sir A, eds. Disorders of porphyrin metabolism. New York: Plenum Medical, 198; 144.
4. The porphyrias;Dean,1971
5. Disorders of porphyrin metabolism,1987