• CAD problem solving and technical systems modelling using the AI programming environmentsKalja, Ahto; Kotkas, Vahur; Tiidemann, TiitInformation Modelling and Knowledge Bases XII2001 / p. 284-290 https://www.researchgate.net/publication/221013967_CAD_Problem_Solving_and_Technical_Systems_Modelling_Using_the_AI_Programming_Environments