@article{MZM_2009_85_5_a16,
     author = {Xianglin Wei and Wenhua Lang and Ren Ding},
     title = {About {Convex} {4-Isosceles} {7-Point} {Sets}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {797--800},
     publisher = {mathdoc},
     volume = {85},
     number = {5},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_85_5_a16/}
}