Conceptual Structures for STEM Research and Education 20th International Conference on Conceptual Structures, ICCS 2013, Mumbai, India, January 10-12, 2013. Proceedings - Pfeiffer, Heather D.; Ignatov, Dmitry I.; Poelmans, Jonas; Gadiraju, Nagarjuna (Springer Berlin Heidelberg : Imprint: Springer, 2013)