@UNPUBLISHED{publication1, title = "Gray codes for signed involutions", author = "{GUTIERRES, Gon{\c{c}}alo} and {MAMEDE, Ricardo} and {SANTOS, Jos{\'{e}} Luis}", year = "2017-11-28", abstract = " In this paper we present two cyclic Gray codes for signed involutions. The first one has a natural construction, implemented by a CAT algorithm, based in the recursive formula for the number of sign involutions. The second code, although with a higher computational cost, has the smallest possible Hamming distance for this family of objects. ", url = "http://www.mat.uc.pt/preprints/eng\_2017.html", note = "" }