@article{barut:1971:ncs,
    author = {Barut, A. O. and Girardello, L.},
     title = {New ``coherent'' states associated with non-compact groups},
   journal = {Comm. Math. Phys.},
  fjournal = {Communications in Mathematical Physics},
    volume = {21},
    number = {1},
      year = {1971},
     pages = {41–55},
      issn = {0010-3616},
   mrclass = {81.22},
  mrnumber = {MR0278632 (43 \#4362)},
mrreviewer = {R. Mirman},
     zblno = {0214.38203}}