García-Pacheco, F. J., Rambla-Barreno, F., & Seoane-Sepúlveda, J. B. (2008). $\mathsf Q$-linear functions, functions with dense graph, and everywhere surjectivity. Mathematica Scandinavica, 102(1), 156-160. https://doi.org/10.7146/math.scand.a-15057