@article{FPM_1998_4_4_a0,
     author = {A. V. Kelarev},
     title = {Recent results and open questions on semigroup graded rings},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {1115--1139},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_4_a0/}
}