PEREIRA, L. da S., L. M. CHAVES, D. J. de SOUZA, and C. J. dos REIS. “GEOMETRY OF BASIC PROPERTIES ON LINEAR REGRESSION AND OF THE MALLOWS’S Cp STATISTICS”. Brazilian Journal of Biometrics, vol. 33, no. 3, Oct. 2015, pp. 357-7, http://www.biometria.ufla.br/index.php/BBJ/article/view/20.