To cite MPCI in publications use:
Santos-Fernández E, Scagliarini M (2012). “MPCI: An R Package for Computing Multivariate Process Capability Indices.” Journal of Statistical Software, 47(7), 1–15. http://www.jstatsoft.org/v47/i07/.
Corresponding BibTeX entry:
@Article{, title = {{MPCI}: An {R} Package for Computing Multivariate Process Capability Indices}, author = {Edgar Santos-Fern{\'a}ndez and Michele Scagliarini}, journal = {Journal of Statistical Software}, year = {2012}, volume = {47}, number = {7}, pages = {1--15}, url = {http://www.jstatsoft.org/v47/i07/}, }