- A double-blind, multicenter comparison of 0.05% halobetasol propionate ointment and 0.05% clobetasol propionate ointment in patients with chronic, localized plaque psoriasis. Goldberg, B., Hartdegen, R., Presbury, D., Smith, E.H., Yawalkar, S. J. Am. Acad. Dermatol. (1991)