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Samppa Suoniemi and  Harri Terho and  Rami Olkkonen,  The Measurement of Endogenous Higher-Order Formative Composite Variables in PLS-SEM: An Empirical Application from CRM System Development.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2012, vol. 72(12). 1648 - 1652[viewed 17 October 2018]. Available from: http://waset.org/publications/8748.