@article {, title = {Variability Testing in the Wild: The Drupal Case Study}, journal = {Software and Systems Modeling Journal}, year = {2017}, month = {Feb}, pages = {1-22}, publisher = {Springer Berlin Heidelberg}, issn = {1619-1366}, doi = {10.1007/s10270-015-0459-z}, author = {Ana B. S{\'a}nchez and S. Segura and Jos{\'e} Antonio Parejo and Antonio Ruiz-Cort{\'e}s} }