@article{JTNB_2016__28_2_539_0,
     author = {Richard, Rodolphe},
     title = {On~$\pi ${-exponentials~II:} {Closed} formula for the index},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {539--556},
     publisher = {Soci\'et\'e Arithm\'etique de Bordeaux},
     volume = {28},
     number = {2},
     year = {2016},
     doi = {10.5802/jtnb.952},
     mrnumber = {3509723},
     zbl = {1377.12004},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jtnb.952/}
}