@article{MS2_1980__46_166700,
     author = {J. Brezinski},
     title = {Arithmetical quadratic surfaces of genus 0, {I.}},
     journal = {Mathematica Scandinavica},
     pages = {183--208},
     year = {1980},
     volume = {46},
     zbl = {0505.14006},
     url = {http://geodesic.mathdoc.fr/item/MS2_1980__46_166700/}
}