@article{Papadopoulos2012,
author = {Papadopoulos, G. and Santos Silva, J.M.C.},
title= {Identification issues in some double-index models for non-negative data},
year = {2012},
doi = {10.1016/j.econlet.2012.06.001},
journal = {Economics Letters},
volume = {117},
number = {1},
pages = {365--367},
}