@article{10_4064_fm_138_2_93_101,
     author = {E. L\'opez-Escobar},
     title = {Formalizing a non-linear {Henkin} quantifier},
     journal = {Fundamenta Mathematicae},
     pages = {93--101},
     publisher = {mathdoc},
     volume = {138},
     number = {2},
     year = {1991},
     doi = {10.4064/fm-138-2-93-101},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-138-2-93-101/}
}