@article{10_4064_aa105_4_6,
     author = {Wenguang Zhai},
     title = {On the number of primitive {Pythagorean} triangles},
     journal = {Acta Arithmetica},
     pages = {387--403},
     year = {2002},
     volume = {105},
     number = {4},
     doi = {10.4064/aa105-4-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa105-4-6/}
}