A Natural Programming Calculus. - Åke Hansson; Sten-Åke Tärnlund (IJCAI, 1979)

Logic Modelling of Cognitive Reasoning. - Göran Hagert; Åke Hansson (IJCAI, 1983)

A Semiformal Metatheory for Fragmentary and Multilayered Knowledge as an Interactive Metalogic Program. - Andreas Hamfelt; Åke Hansson (FGCS, 1992)

Representation of Fragmentary Multilayered Knowledge. - Andreas Hamfelt; Åke Hansson (META, 1992)