TY  - COMP
A1  - Wuertz, D.
A1  - Chalabi, Y.
A1  - Maechler, M.  Version . 
T1  - timeDate: Rmetrics– Chronological and calendar objects
Y1  - 2012
UR  - http://cran.r-project.org/web/packages/timeDate/index.html
N1  - (Accessed January 16, 2013); 2160.97

ER  -