@Article{hint, author = {Sanford Weisberg and Hadley Wickham}, journal = {R News}, number = {3}, pages = {36––38}, title = {Need A Hint?}, url = {http://cran.r-project.org/doc/Rnews/Rnews_2007-3.pdf}, volume = {7}, year = {2007}, bdsk-url-1 = {http://cran.r-project.org/doc/Rnews/Rnews_2007-3.pdf}, }