Hristu, Radu
Stanciu, Stefan G.
Tranca, Denis E.
Polychroniadis, Efstathios K.
Stanciu, George A.
Article History
Received: 9 January 2017
Accepted: 23 May 2017
First Online: 7 July 2017
Competing Interests
: The authors declare that they have no competing interests.