Boyvalenkov, P. G.
Dragnev, P. D.
Hardin, D. P.
Saff, E. B.
Stoyanova, M. M.
Funding for this research was provided by:
Bulgarian National Science Fund (I01/0003)
Simons Foundation (282207)
National Science Foundation (DMS-1412428, DMS-1412428)
National Science Foundation (DMS-1516400, DMS-1516400)
Science Foundation of Sofia University (144/2015, 57/2016)
Article History
Received: 12 October 2015
Revised: 23 September 2016
Accepted: 26 September 2016
First Online: 14 October 2016