Discrete MathematicsVolume 116, Issues 1–3, 1 June 1993, Page 5Editors' prefaceAuthor links open overlay panelY. Fujikoshi, S. Kageyama, M. Kuwada, T. ShohojiShow moreShareCitehttps://doi.org/10.1016/0012-365X(93)90389-BGet rights and contentUnder an Elsevier user licenseopen archivePrevious article in issueNext article in issueRecommended articlesCited by (0)Copyright © 1993 Published by Elsevier B.V.