Vinca Institute of Nuclear Sciences;
University of Belgrade;
P.O.Box 522;
11001 Belgrade;
Serbia;
Lawrence Livermore National Laboratory;
Livermore;
California 94550;
USA;
Aston Institute of Photonic Technologies;
Aston University;
B47ET Birmingham;
UK;
Laboratory of Nonlinear Photonics;
Novosibirsk State University;
Novosibirsk;
630090;
Russia;
coherent energy propagation; multicore fibers; nonlinear vortices;