@article{TIMM_2018_24_4_a22,
     author = {Y. Liu and G. Xu and J. Zhang},
     title = {Best restricted approximation of smooth function classes},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {283--294},
     year = {2018},
     volume = {24},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2018_24_4_a22/}
}