Funding for this research was provided by:
Xunta de Galicia (GPC ED431B 2016/035, 2016-2019 ED431G/01)
Ministerio de Economia, Industria y ompetitividad (TIN2015-70266-C2-1-P)
Universidad Politécnica de Madrid (RP151046021)
Article History
Received: 5 September 2017
Accepted: 2 June 2018
First Online: 13 June 2018