PĂ©rez, Angela M.
Spasibko, Kirill Yu
Sharapova, Polina R.
Tikhonova, Olga V.
Leuchs, Gerd
Chekhova, Maria V.
Article History
Received: 13 January 2015
Accepted: 3 June 2015
First Online: 17 July 2015
Competing interests
: The authors declare no competing financial interests.