@article{ZNSL_2019_487_a2,
     author = {N. M. Belousov and S. \`E. Derkachev},
     title = {Completeness of the $3j$-symbols for $SL(2,\mathbb C)$ group},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {40--52},
     year = {2019},
     volume = {487},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2019_487_a2/}
}