• Towards a Hierarchy of Visual Languages,
  K. Marriott and B. Meyer
• Relational Grammars: Theory and Practice in a Visual Language Interface for Process Modeling,
  K. Wittenburg and L. Weitzman
  
• Relation Grammars: a Grammatical Model for a High-Level Specification of Visual Languages,
  F. Ferrucci, G. Tortora, M. Tucci, and G. Vitiello
• How to Represent a Visual Program?,
  M. Andries, G. Engels, and J. Rekers
• A Fully Formalized Theory for Describing Visual Notations,
  V. Haarslev
• Visual Language Syntax and Semantics: a Spatial Logic Approach,
  J.M. Gooday and A.G. Cohn
• A Syntax Directed Approach to Picture Semantics,
  D. Wang and H. Zeevat
• On the Isormorhism (or Otherwise) of Representations,
  C.A. Gurr
• Specifying Input and Output of Visual Languages,
  T.B. Dinesh and S. Üsküdarli
• Specification of Visual Languages as Means for Interaction,
  P. Bottoni, M.F. Costabile, S. Levialdi, and P. Mussio

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