@ARTICLE{ijseke13,
  author = {Ruben Heradio and David Fernandez-Amoros and Jose Antonio Cerrada
	and Ismael Abad},
  title = {A Literature Review on Feature Diagram Product Counting and Its Usage
	in Software Product Line Economic Models},
  journal = {International Journal of Software Engineering and Knowledge Engineering},
  year = {2013},
  volume = {23},
  number = {8},
  month = {October}
}