@book{MSMF_1997_2_68__1_0,
     author = {Leichtnam, \'Eric and Piazza, Paolo},
     title = {The $b$-pseudodifferential calculus on {Galois} coverings and a higher {Atiyah-Patodi-Singer} index theorem},
     series = {M\'emoires de la Soci\'et\'e Math\'ematique de France},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {68},
     year = {1997},
     doi = {10.24033/msmf.382},
     mrnumber = {99d:58168},
     zbl = {0942.58003},
     language = {en},
     url = {http://archive.numdam.org/item/MSMF_1997_2_68__1_0/}
}