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Rustin, M.H.A.; Newton, Julia A.; Smith, N.P.; Dowd, Pauline M. «The treatment of chilblains with nifedipine: the results of a pilot study, a double-blind placebo-controlled randomized study and a long-term open trial». British Journal of Dermatology, 120, 2, 2006, pàg. 267–75. DOI: 10.1111/j.1365-2133.1989.tb07792.x. PMID: 2647123.
Rustin, M.H.A.; Newton, Julia A.; Smith, N.P.; Dowd, Pauline M. «The treatment of chilblains with nifedipine: the results of a pilot study, a double-blind placebo-controlled randomized study and a long-term open trial». British Journal of Dermatology, 120, 2, 2006, pàg. 267–75. DOI: 10.1111/j.1365-2133.1989.tb07792.x. PMID: 2647123.