@article{10_4064_fm_81_3_255_260,
     author = {H. Dishkant},
     title = {Weak decidability of some modal extention of trigonometry},
     journal = {Fundamenta Mathematicae},
     pages = {255--260},
     publisher = {mathdoc},
     volume = {81},
     number = {3},
     year = {1973},
     doi = {10.4064/fm-81-3-255-260},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-81-3-255-260/}
}