Janis.Osis@rtu.lv
erika.asnina@rtu.lv
uldis.donins@rtu.lv
garciavicente@uniovi.es
© 2015 Janis Osis, Erika Asnina, Uldis Donins, Vicente García-Díaz, published by Riga Technical UniversityThis work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.