In fact Dymola was published (including source code) in Hilding Elmqvist's doctoral thesis:
Elmqvist, H. (1978). A Structured Model Language for Large Continuous Systems. [Doctoral Thesis (monograph), Department of Automatic Control]. Department of Automatic Control, Lund Institute of Technology (LTH).
Elmqvist, H. (1978). A Structured Model Language for Large Continuous Systems. [Doctoral Thesis (monograph), Department of Automatic Control]. Department of Automatic Control, Lund Institute of Technology (LTH).
portal: https://portal.research.lu.se/en/publications/a-structured-m...
direct pdf link: https://lucris.lub.lu.se/ws/portalfiles/portal/4602422/85704...