@conference {, title = {Modelling Service Level Agreements for Business Process Outsourcing Services}, booktitle = {International Conference on Advance Information Systems Engineering (CAiSE)}, series = {LNCS}, volume = {9097}, year = {2015}, pages = {485-500}, author = {Adela del-R{\'\i}o-Ortega and Antonio Manuel Gutierrez and Amador Dur{\'a}n and Manuel Resinas and Antonio Ruiz-Cort{\'e}s} }