@article{AMI_2013_42_a6,
     author = {Ferenc Nagy and Roland Kunkli},
     title = {Method for computing angle constrained isoptic curves for surfaces},
     journal = {Annales mathematicae et informaticae},
     pages = {65--70},
     publisher = {mathdoc},
     volume = {42},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2013_42_a6/}
}