@article{zu213308,
           title = {Extremal problem with variable quantity of points on rays},
          author = {A. L. Targonskii},
            year = {2013},
         journal = {International Conference  "Complex Analysis, Potential Theory and Applications"},
             url = {http://eprints.zu.edu.ua/13308/},
        abstract = {To find a maximum functional}
}