@article{ASNSP_2007_5_6_1_81_0,
     author = {Rito, Carlos},
     title = {On surfaces with $p_g = q = 1$ and non-ruled bicanonical involution},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {81--102},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 6},
     number = {1},
     year = {2007},
     zbl = {1180.14040},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2007_5_6_1_81_0/}
}