@misc{10_1017_S0017089500009988,
     title = {Pythagorean ratios in arithmetic progression, part i. three {Pythagorean} ratios},
     journal = {Glasgow mathematical journal},
     pages = {395--407},
     year = {1993},
     volume = {35},
     number = {3},
     doi = {10.1017/S0017089500009988},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009988/}
}