Herbert Coblans: A Biography. - Edward Carter (J. Documentation, 1978)

Graph-Based Approaches to Software Watermarking. - Christian S. Collberg; Stephen G. Kobourov; Edward Carter; Clark D. Thomborson (WG, 2003)

Graph Theoretic Software Watermarks: Implementation, Analysis, and Attacks. - Christian S. Collberg; Andrew Huntwork; Edward Carter; Gregg M. Townsend (Information Hiding, 2004)

Dynamic path-based software watermarking. - Christian S. Collberg; Edward Carter; Saumya K. Debray; Andrew Huntwork; John D. Kececioglu; Cullen Linn; Michael Stepp (PLDI, 2004)

More on graph theoretic software watermarks: Implementation, analysis, and attacks. - Christian S. Collberg; Andrew Huntwork; Edward Carter; Gregg M. Townsend; Michael Stepp (Inf. Softw. Technol., 2009)