@article{RLIN_1990_9_1_4_a8,
     author = {Besson, G\'erard and Bordoni, Manlio},
     title = {On the spectrum of {Riemannian} submersions with totally geodesic fibers},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {335--340},
     publisher = {mathdoc},
     volume = {Ser. 9, 1},
     number = {4},
     year = {1990},
     zbl = {0716.53031},
     mrnumber = {650387},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1990_9_1_4_a8/}
}