@article{SM_1970_10_1_a4,
     author = {M. Sh. Tsalenko},
     title = {The semigroup of reflective subcategories},
     journal = {Sbornik. Mathematics},
     pages = {61--75},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_10_1_a4/}
}