References
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IBM. (n.d.) Introduction to IBM IT system viewpoint. Retrieved from http://www.ibm.com/developerworks/rational/library/08/0108_cooks-cripps-spaas/.
Kruchten, P. (1995, November). Architectural blueprints—The “4+1” view model of software architecture. IEEE Software, 12(6), 42–50. Retrieved from http://www.cs.ubc.ca/~gregor/teaching/papers/4+1view-architecture.pdf.