@article{RSMUP_2002__107__165_0,
     author = {Esposito, Pierpaolo},
     title = {Perturbations of {Paneitz-Branson} operators on $S^n$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {165--184},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {107},
     year = {2002},
     mrnumber = {1926208},
     zbl = {1165.58305},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_2002__107__165_0/}
}