@misc{misc85420dce,
title   = {An introduction to R: Sottware for statistical modelling & computing},
author = {Kuhnert, Petra and Venables, B. and Demétrio, Clarice Garcia Borges and Zocchi, Sílvio Sandoval},
year = {2005},
publisher = {USP/ESALQ-LCE}
}