N. Enlund and H. E. Andersin, The Early Days of Computer Aided Newspaper Production Systems, History of Nordic Computing 2, IFIP AICT 303, pp.238-249, 2009.
DOI : 10.1007/978-3-642-03757-3_25

R. Sulonen, High-Level Concepts for a Graphical Programming Language, 1975.

M. Syrjänen, On Construction of Correct Programs as a Two-level Process Appendix Names of People Involved in Computer Science Teaching at HUT during the First Ten Years, 1975.