Geodesic
Regularity and Planarity of Token Graphs
Discussiones Mathematicae. Graph Theory, Tome 37 (2017) no. 3, pp. 573-586

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Let G = (V, E) be a graph of order n and let 1 ≤ k lt; n be an integer. The k-token graph of G is the graph whose vertices are all the k-subsets of V, two of which are adjacent whenever their symmetric difference is a pair of adjacent vertices in G. In this paper we characterize precisely, for each value of k, which graphs have a regular k-token graph and which connected graphs have a planar k-token graph.
Keywords: token graph, Johnson graph, regularity, planarity 
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Carballosa, Walter; Fabila-Monroy, Ruy; Leaños, Jesús; Rivera, Luis Manuel. Regularity and Planarity of Token Graphs. Discussiones Mathematicae. Graph Theory, Tome 37 (2017) no. 3, pp. 573-586. http://geodesic.mathdoc.fr/item/DMGT_2017_37_3_a5/