PT Unknown AU Koppenhagen, N Katz, N Mädche, A Müller, B TI How Do Procurement Networks Become Social? Design Principles Evaluation in a Heterogeneous Environment of Structured and Unstructured Interactions SE International Conference on Information Systems (ICIS), Shanghai, China, 4-7 December 2011. Vol. 5 PY 2012 BP 3635 EP 3653 LA english ER