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2. Untersuchungen über die Wirkung der Vitamin-A-Säure;Beer;Dermatologica,1962
3. Influence of vitamin A on the epidermis;Bern;Am. J. Anat.,1955
4. Aromatic retinoid in the treatment of multiple superficial basal cell carcinoma, arsenic keratosis and keratoacanthoma;Berretti,1980
5. Ultrastructural study in the four main types of ichthyosis after one-month-treatment with Ro 10-9359;Blanchet-Bardon,1980