@article{10_37236_6536,
     author = {Pascal Ochem and Matthieu Rosenfeld},
     title = {Avoidability of formulas with two variables},
     journal = {The electronic journal of combinatorics},
     year = {2017},
     volume = {24},
     number = {4},
     doi = {10.37236/6536},
     zbl = {1374.68359},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/6536/}
}