@article{JSFS_2002__143_1-2_79_0,
     author = {Pinheiro, Jos\'e C.},
     title = {Model building using covariates in nonlinear mixed-effects models},
     journal = {Journal de la soci\'et\'e fran\c{c}aise de statistique},
     pages = {79--101},
     publisher = {Soci\'et\'e fran\c{c}aise de statistique},
     volume = {143},
     number = {1-2},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFS_2002__143_1-2_79_0/}
}