1. A. B. Dainiak, “Sharp Bounds for the Number of Maximal Independent Sets in Trees of Fixed Diameter,” arXiv:0812.4948v1.
2. A. Frendrup, A. S. Pedersen, A. A. Sapozhenko, and P. D. Vestergaard, Merrifield-Simmons Index and Minimum Number of Independent Sets in Short Trees, Research Report Series, ISSN 1399-2503, R-2009-03 (Department of Mathematical Sciences, Aalborg Univ., 2009).
3. A. S. Pedersen and P. D. Vestergaard, “An Upper Bound on the Number of Independent Sets in a Tree,” Ars Combinatoria 84, 85–96 (2007).