Propagation of program control: A tool for distributed disease surveillance. - Johan Gustav Bellika; Toralf Hasvold; Gunnar Hartvigsen (Int. J. Medical Informatics, 2007)

Properties of a federated epidemiology query system. - Johan Gustav Bellika; Hoylen Sue; Linda Bird; Andrew Goodchild; Toralf Hasvold; Gunnar Hartvigsen (Int. J. Medical Informatics, 2007)