@article{MZM_2009_86_5_a7,
     author = {Lu Jiafeng},
     title = {Algebras with {Periodic} {Shifts} of {Ext} {Degrees}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {705--724},
     publisher = {mathdoc},
     volume = {86},
     number = {5},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_86_5_a7/}
}