@article{AMI_2013_42_a2,
     author = {Marina Grebenyuk and Josef Mike\v{s}},
     title = {On normals of manifolds in multidimensional projective space},
     journal = {Annales mathematicae et informaticae},
     pages = {23--28},
     publisher = {mathdoc},
     volume = {42},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AMI_2013_42_a2/}
}