1. Proofs that Really Count, The Art of Combinatorial Proof;Benjamin,2003
2. Low-dimensional lattices. VII. Coordination sequences;Conway;Proc. R. Soc. Lond. Ser. A,1997
3. The solution of the equation XA+AXT=0 and its application to the theory of orbits;De Terán;Linear Algebra Appl.,2011
4. Andrii Dmytryshyn, Bo Kågström, Vladimir V. Sergeichuk, Symmetric matrix pencils: Codimension counts and the solution of a pair of matrix equations, UMINF-13/12, Technical Report SE-901 87, Umea University, Department of Computing Science, Umea, Sweden.
5. Skew-symmetric matrix pencils: Codimension counts and the solution of a pair of matrix equations;Dmytryshyn;Linear Algebra Appl.,2013