@Book{BVMC:619494, author = {De Gregorio, Pietro}, title = {Petri de Gregorio Messanensis Siculi equitis et iurisconsulti famosissimi ... De concessione feudi tractatus}, url = {https://www.cervantesvirtual.com/obra/petri-de-gregorio-messanensis-siculi-equitis-et-iurisconsulti-famosissimi--de-concessione-feudi-tractatus} }