Balikyan , S. V. ., and . R. R. . Kamalian. “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, vol. 31, Dec. 2021, pp. 116-21, http://mpcs.sci.am/index.php/mpcs/article/view/398.