Archieving Canonical PDF Validation. - Duff Johnson (iPRES, 2014)

Surveying ISO Standards for PDF: archive, accessibility, engineering, metadata, 3D data and PDF itself. History, pain points, solutions and the dream.. - Duff Johnson (iPRES, 2014)

veraPDF: open source PDF/A validation through pragmatic partnership. - Rebecca McGuinness; Carl Wilson; Duff Johnson; Boris Doubrov (iPRES, 2017)

The application/pdf Media Type. - Matthew Hardy; Larry Masinter; Dejan Markovic; Duff Johnson; Martin Bailey (RFC, 2017)