@article{RSMUP_1971__46__49_0,
     author = {Zamfirescu, Tudor},
     title = {Area contractions in the plane},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {49--52},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {46},
     year = {1971},
     mrnumber = {310856},
     zbl = {0234.54017},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1971__46__49_0/}
}