@article{10_4064_ap107_1_4,
     author = {Dae Won Yoon and Y{\i}lmaz Tun\c{c}er and Murat Kemal Karacan},
     title = {Non-degenerate quadric surfaces of {Weingarten} type},
     journal = {Annales Polonici Mathematici},
     pages = {59--69},
     publisher = {mathdoc},
     volume = {107},
     number = {1},
     year = {2013},
     doi = {10.4064/ap107-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap107-1-4/}
}