Stanislav Jendrol. Triangles with restricted degrees of their boundary vertices in plane triangulations. Discrete Mathematics, 196(1-3):177-196, 1999. [doi]
@article{Jendrol99, title = {Triangles with restricted degrees of their boundary vertices in plane triangulations}, author = {Stanislav Jendrol}, year = {1999}, doi = {10.1016/S0012-365X(98)00172-1}, url = {http://dx.doi.org/10.1016/S0012-365X(98)00172-1}, researchr = {https://researchr.org/publication/Jendrol99}, cites = {0}, citedby = {0}, journal = {Discrete Mathematics}, volume = {196}, number = {1-3}, pages = {177-196}, }