A Model for Studying Ambiguity in SGML Element Declarations. - R. W. Matzen; K. M. George; George E. Hedrick (SAC, 1993)

A Formal Language Model for Parsing SGML. - R. W. Matzen; K. M. George; George E. Hedrick (J. Syst. Softw., 1997)

A new tool for SGML with applications for the World Wide Web. - R. W. Matzen; George E. Hedrick (SAC, 1998)

A New Generation of Tools for SGML. - R. W. Matzen (Markup Lang., 1999)