Tobias Blickle Gábor Gy. Halász János Tóth Structures, hypergraphs, and knowledge representation in chemical engineering science. I - Problem formulation. 142-152 1990 5 AI in Engineering 3 http://dx.doi.org/10.1016/0954-1810(90)90042-3 db/journals/aei/aie5.html#BlickleHT90