@incollection{JEDP_1997____A1_0,
     author = {Ashbaugh, M. and Levine, Howard A.},
     title = {Inequalities for {Dirichlet} and {Neumann} eingenvalues of the laplacian for domains on spheres},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {1},
     pages = {1--15},
     publisher = {Ecole polytechnique},
     year = {1997},
     zbl = {01808661},
     language = {en},
     url = {http://www.numdam.org/item/JEDP_1997____A1_0/}
}