Barrett, W., S. Fallat, H. T. Hall, L. Hogben, J. C.-H. Lin, and B. L. Shader. “Generalizations of the Strong Arnold Property and the Minimum Number of Distinct Eigenvalues of a Graph”. The Electronic Journal of Combinatorics, Vol. 24, no. 2, June 2017, p. P2.40, doi:10.37236/5725.