Tosti A, De Padova M P, Minghetti G, Veronesi S
J Am Acad Dermatol. 1986 Aug;15(2 Pt 1):209-10. doi: 10.1016/s0190-9622(86)70158-8.
We report the results of a controlled trial on 119 patients affected by patchy alopecia areata involving less than 40% of the scalp. The statistical analysis showed no differences between the results obtained using squaric acid dibutylester, diphencyprone, minoxidil, and placebo in the treatment of this form of alopecia.