@article{BSL_2020_49_3_a2,
     author = {Takano, Mitio},
     title = {New {Modification} of the {Subformula} {Property} for a {Modal} {Logic}},
     journal = {Bulletin of the Section of Logic},
     pages = {255--268},
     publisher = {mathdoc},
     volume = {49},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BSL_2020_49_3_a2/}
}