@article{ZNSL_2021_509_a6,
     author = {S. E. Derkachev and A. V. Ivanov},
     title = {Racah coefficients for the group $\mathrm{SL}(2,\mathbb{R})$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {99--112},
     publisher = {mathdoc},
     volume = {509},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2021_509_a6/}
}