@article{RCM_1985__19_181751,
     author = {E.G.K. L\'opez-Escobar},
     title = {On {Intuitionistic} {Sentential} {Connectives} {I.}},
     journal = {Revista colombiana de matematicas},
     pages = {117--130},
     publisher = {mathdoc},
     volume = {19},
     year = {1985},
     zbl = {0616.03035},
     url = {http://geodesic.mathdoc.fr/item/RCM_1985__19_181751/}
}