R. Boehm and B. W. , A spiral model of software development and enhancement, Computer, vol.21, issue.5, pp.61-72, 1988.
DOI : 10.1109/2.59

M. Kaib, A. Picot, A. W. Scheer, C. Düpmeier, and H. Eggert, A project to establish a virtual enterprise for distributed development and fabrication of MicrosystemsEd.); in Organisationsstrukturen der Wirtschaft und ihre Anforderungen an die Informations-und Kommunikationstechnik, in: Handbuch Informationsmanagement, Aufgaben -Konzepte ? Praxislösungen; Gabler-Verlag WILDFLOW -components for building scientific and technical work environments, Enterprise Application Integration, DUV wirtschaftsinformatik Internat. Conf. on Web-Based Modelling and SimulationVirt09] N.N., Web portal of the California Network " Virtual Enterprise, p.7, 1993.