@article{BueckerKraemerArnold2012, author = {B{\"u}cker, Michael and Kr{\"a}mer, Walter and Arnold, Matthias}, title = {A Hausman test for non-ignorability}, series = {Economics Letters}, volume = {114}, journal = {Economics Letters}, number = {1}, doi = {10.1016/j.econlet.2011.08.025}, pages = {23 -- 25}, year = {2012}, language = {en} }