Burgdorf WH, Scholz A (July 2004). "Helen Ollendorff Curth and William Curth: from Breslau and Berlin to Bar Harbor". J. Am. Acad. Dermatol. 51 (1): 84–9. doi:10.1016/j.jaad.2003.12.035. PMID15243529.
Burgdorf WH, Scholz A (July 2004). "Helen Ollendorff Curth and William Curth: from Breslau and Berlin to Bar Harbor". J. Am. Acad. Dermatol. 51 (1): 84–9. doi:10.1016/j.jaad.2003.12.035. PMID15243529.