Ramonda, R., P. Zucchetta, C. Contessa, and L. Punzi. “The Psoriatic Great Toe or the Psoriatic Onycho-Pachydermo-Periostitis of Great Toe (OP3gt)”. Reumatismo, vol. 56, no. 4, Dec. 2004, pp. 282-5, doi:10.4081/reumatismo.2004.282.