Ortin, F.; Zapico, D.; Perez-Schofield, J.B.G.; Garcia, M.: 'Including both static and dynamic typing in the same programming language', IET Software, 2010, 4, (4), p. 268-282, DOI: 10.1049/iet-sen.2009.0070
IET Digital Library, https://digital-library.theiet.org/;jsessionid=56u9fuffp27v0.x-iet-live-01content/journals/10.1049/iet-sen.2009.0070