%0 Journal Article %A Silvana Bazzoni %A Giovanna Le Gros %T $\mathcal P_1$-covers over commutative rings %J Rendiconti del Seminario Matematico della Università di Padova %D 2020 %P 27-43 %V 144 %U http://www.numdam.org/articles/10.4171/rsmup/54/ %R 10.4171/rsmup/54 %G en %F RSMUP_2020__144__27_0