1. Anaphylactic reaction to vitamin B 12 appearing after several years of treatment;Ugwu, C.N.; Gibbins, F.J.;Age Ageing,1981
2. Sensitivity to cyanocobalamin and hydroxocobalamin;James, J.; Warin, R.P.;BMJt,1971
3. IgE-mediated reaction to hydroxocobalamin injection in patient with pernicious anaemia;F, De Blay; MF, Sager; C, Hirth;Lancet,1992
4. Anaphylactic reaction to hydroxycobalamin;Branco-Ferreira, M.; Glode, M.H.-; Pereira-Barbosa, M.A.; Palma-Carlos, A.G.;Allergy,1997