@article{10_4153_S0008439520000739,
     author = {Nghiem, Tran-Trung and Reichstein, Zinovy},
     title = {On a rationality problem for fields of cross-ratios {II}},
     journal = {Canadian mathematical bulletin},
     pages = {667--677},
     year = {2021},
     volume = {64},
     number = {3},
     doi = {10.4153/S0008439520000739},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000739/}
}