@article{raynal:1979:odp,
    author = {Raynal, Jacques},
     title = {On the definition and properties of generalized $6$-$j$\
              symbols},
   journal = {J. Math. Phys.},
  fjournal = {Journal of Mathematical Physics},
    volume = {20},
      year = {1979},
    number = {12},
     pages = {2398–2415},
      issn = {0022-2488},
     coden = {JMAPAQ},
   mrclass = {33A75 (22E70 81C40)},
  mrnumber = {MR0553502 (81b:33022)},
mrreviewer = {S. Saran},
       doi = {10.1063/1.524047},
     zblno = {0449.33019}}