@article{RSMUP_2020__144__27_0,
     author = {Silvana Bazzoni and Giovanna Le Gros},
     title = {
               $\mathcal P_1$-covers over commutative rings},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {27--43},
     volume = {144},
     year = {2020},
     doi = {10.4171/rsmup/54},
     mrnumber = {4186444},
     language = {en},
     url = {http://archive.numdam.org/articles/10.4171/rsmup/54/}
}