@article{RSMUP_2006__115__R5_0,
     author = {D{\textquoteright}Agnolo, Andrea and Zacher, Giovanni},
     title = {Dedication to {Guido} {Zappa} on his 90th anniversary},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {v--xi},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {115},
     year = {2006},
     mrnumber = {2245582},
     zbl = {1167.01318},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2006__115__R5_0/}
}