Singh, R. P., and H. Singh. “Defining the Logical Boundary of a Service: An Improved Model and Novel Metrics for Service-Oriented Systems”. INFOCOMP Journal of Computer Science, vol. 19, no. 2, Dec. 2020, pp. 10-22, https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/964.