@article{10_37236_10218, author = {Vjekoslav Kova\v{c}}, title = {Popular differences for right isosceles triangles}, journal = {The electronic journal of combinatorics}, year = {2021}, volume = {28}, number = {4}, doi = {10.37236/10218}, zbl = {1498.11041}, url = {http://geodesic.mathdoc.fr/articles/10.37236/10218/} }