@article{MABA_2013_27_1-2_a6,
     author = {Bl. Sendov and H. Sendov},
     title = {Extention of {Apolarity} and {Grace} {Theorem}},
     journal = {Mathematica balkanica},
     pages = {77},
     publisher = {mathdoc},
     volume = {27},
     number = {1-2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/MABA_2013_27_1-2_a6/}
}