@article{10_1090_S0894_0347_07_00567_X,
     author = {Hiraga, Kaoru and Ichino, Atsushi and Ikeda, Tamotsu},
     title = {Formal degrees and adjoint 𝛾-factors},
     journal = {Journal of the American Mathematical Society},
     pages = {283--304},
     year = {2008},
     volume = {21},
     number = {1},
     doi = {10.1090/S0894-0347-07-00567-X},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-07-00567-X/}
}