Rakowska, Adriana, et al. “New Trichoscopy Findings in Trichotillomania: Flame Hairs, V-Sign, Hook Hairs, Hair Powder, Tulip Hairs”. Acta Dermato-Venereologica, vol. 94, no. 3, Sept. 2013, pp. 303-6, doi:10.2340/00015555-1674.