@article{KJM_2004_26_1_a5,
     author = {Marija Stani\'c},
     title = {S-orthogonality on the semicircle},
     journal = {Kragujevac Journal of Mathematics},
     pages = {39 - 48},
     year = {2004},
     volume = {26},
     number = {1},
     zbl = {1077.05100},
     url = {http://geodesic.mathdoc.fr/item/KJM_2004_26_1_a5/}
}