Eur. Phys. J. Special Topics 222, 1745-1748 (2013)
https://doi.org/10.1140/epjst/e2013-01960-6

Editorial

¹ Department of Mathematics, Xiangtan University, Xiangtan, Hunan 411105, PR China
² Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119991 Moscow, Russia
³ Departamento de Análisis Matemático, Universidad de La Laguna, 38271 Tenerife, Spain
⁴ Department of Mathematics, University of Bari, via Orabona n. 4, 70125 Bari, Italy

^a e-mail: yzhou@xtu.edu.cn
^b e-mail: tarasov@theory.sinp.msu.ru
^c e-mail: jtrujill@ullmat.es
^d e-mail: roberto.garrappa@uniba.it

Received: 28 July 2013
Revised: 6 August 2013
Published online: 7 October 2013

This article has no abstract.