Beuscher, Tara L.; Andrews, Sarah E. (November 2020). "What Are COVID Toes? A Case Study". Journal of Wound, Ostomy & Continence Nursing47 (6): 619–621. doi:10.1097/WON.0000000000000711. PMID33201148.
Rustin, M.H.A.; Newton, Julia A.; Smith, N.P.; Dowd, Pauline M. (2006). "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 Dermatology120 (2): 267–75. doi:10.1111/j.1365-2133.1989.tb07792.x. PMID2647123.
Beuscher, Tara L.; Andrews, Sarah E. (November 2020). "What Are COVID Toes? A Case Study". Journal of Wound, Ostomy & Continence Nursing47 (6): 619–621. doi:10.1097/WON.0000000000000711. PMID33201148.
Rustin, M.H.A.; Newton, Julia A.; Smith, N.P.; Dowd, Pauline M. (2006). "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 Dermatology120 (2): 267–75. doi:10.1111/j.1365-2133.1989.tb07792.x. PMID2647123.