@article{RSMUP_1953__22__38_0,
     author = {Pini, Bruno},
     title = {Sui cicli relativi ai sistemi ai differenziali totali},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {38--63},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {22},
     year = {1953},
     mrnumber = {57424},
     zbl = {0052.09601},
     language = {it},
     url = {http://archive.numdam.org/item/RSMUP_1953__22__38_0/}
}