@article{10_2298_FIL2008667E,
     author = {Ali Akbar Estaji and Toktam Haghdadi},
     title = {The pointfree version of grills},
     journal = {Filomat},
     pages = {2667 },
     year = {2020},
     volume = {34},
     number = {8},
     doi = {10.2298/FIL2008667E},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/FIL2008667E/}
}