@article{DAN_1963_152_3_a3,
     author = {B. N. Delone and S. S. Ryshkov},
     title = {Solution of the problem on the least dense lattice covering of a 4-dimensional space by equal spheres},
     journal = {Doklady Akademii Nauk},
     pages = {523--524},
     publisher = {mathdoc},
     volume = {152},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_3_a3/}
}