@article{AMI_2006_33_a2,
     author = {Zvonko \v{C}erin and Gian Mario Gianella},
     title = {Cyclic quadrangles from squares},
     journal = {Annales mathematicae et informaticae},
     pages = {23--34},
     publisher = {mathdoc},
     volume = {33},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2006_33_a2/}
}