Discrete Applied MathematicsVolume 33, Issues 1–3, 7 November 1991, Pages 1-2PrefaceAuthor links open overlay panelH.F. Mattson Jr, Teo MoraShow moreShareCitehttps://doi.org/10.1016/0166-218X(91)90103-4Get rights and contentUnder a Creative Commons licenseopen archivePrevious article in issueNext article in issueRecommended articlesCited by (0)Copyright © 1991 Published by Elsevier B.V.