@article{KJM_2021_45_2_a4,
     author = {Amine Benaissa Cherif and Fatima Zohra Ladrani},
     title = {Density {Problems} in {Sobolev's} {Spaces} on {Time} {Scales}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {215 },
     publisher = {mathdoc},
     volume = {45},
     number = {2},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KJM_2021_45_2_a4/}
}