Ivar Jacobson Pan Wei Ng Paul McMahon Ian Spence Svante Lidman The essence of software engineering: the SEMAT kernel. 42-49 2012 55 Commun. ACM 12 https://doi.org/10.1145/2380656.2380670 https://www.wikidata.org/entity/Q125080008 db/journals/cacm/cacm55.html#JacobsonNMSL12