@article{din:1981:ssf,
    author = {Din, A. M.},
     title = {A simple sum formula for {C}lebsch-{G}ordan coefficients},
   journal = {Lett. Math. Phys.},
  fjournal = {Letters in Mathematical Physics. A Journal for the Rapid
              Dissemination of Short Contributions in the Field of
              Mathematical Physics},
    volume = {5},
      year = {1981},
    number = {3},
     pages = {207–211},
      issn = {0377-9017},
     coden = {LMPHDY},
   mrclass = {81C40 (22E70)},
  mrnumber = {MR624763 (82h:81051)},
       doi = {10.1007/BF00420700},
     zblno = {0463.33010}}