Discrete MathematicsVolume 204, Issues 1–3, 6 June 1999, Pages 1-3PrefaceAuthor links open overlay panelL.M. Gessel (Guest Editor), L.W. Shapiro (Guest Editor), D.G. Rogers (Guest Editor)Show moreShareCitehttps://doi.org/10.1016/S0012-365X(99)00102-8Get rights and contentUnder an Elsevier user licenseopen archivePrevious article in issueNext article in issueRecommended articlesCited by (0)Copyright © 1999 Published by Elsevier B.V.