@article{MET_1988__35_3-4_176193,
     author = {H. Kaufmann},
     title = {On {Existence} and {Uniqueness} of {Maximum} {Likelihood} {Estimates} in {Quantal} and {Ordinal} {Response} {Models.}},
     journal = {Metrika},
     pages = {291--313},
     publisher = {mathdoc},
     volume = {35},
     number = {3-4},
     year = {1988},
     zbl = {0671.62053},
     url = {http://geodesic.mathdoc.fr/item/MET_1988__35_3-4_176193/}
}