@article{RSMUP_1992__87__1_0,
     author = {Biliotti, Mauro and Micelli, Giuseppe},
     title = {On the planar translation structures},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--17},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {87},
     year = {1992},
     mrnumber = {1183898},
     zbl = {0764.51003},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1992__87__1_0/}
}