Balikyan , Suren V., and Rafayel R. Kamalian. 2021. “Necessary and Sufficient Condition for Existence of Locally-Balanced 2-Partition of a Tree under the Extended Definition of a Neighbourhood of a Vertex”. Mathematical Problems of Computer Science 31 (December):116-21. http://93.187.165.2/index.php/mpcs/article/view/398.