Carlos Mario Zapata Jaramillo Alexander F. Gelbukh Fernando Arango Isaza Pre-conceptual Schema: A Conceptual-Graph-Like Knowledge Representation for Requirements Elicitation. 27-37 2006 conf/micai/2006 MICAI http://dx.doi.org/10.1007/11925231_3 db/conf/micai/micai2006.html#JaramilloGI06