1. V. Álvarez, J.A. Armario, R.M. Falcón, M.D. Frau, F. Gudiel, M.B. Güemes, A. Osuna, Generating partial Hadamard matrices as solutions to a constraint satisfaction problem characterizing cliques. in: Proceedings of X Encuentro Andaluz de Matemática Discreta, pp. 17–20 ISBN: 978-84-697-4743-8, (La Línea, Cádiz, July 10–11 2017).
2. Searching for partial Hadamard matrices;Álvarez,2012
3. The maximum clique problem;Bomze,1999
4. On the assymptotic existence of partial complex hadamard matrices and related combinatorial objects;de Launey;Discrete Appl. Math.,2000
5. A comment on the hadamard conjecture;de Launey;J. Combin. Theory Ser. A,2001