@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://www.numdam.org/item/RSMUP_2002__107__165_0/} }