© the Authors, 2015. This is an open access article published by Kauno Technologijos Universitetas and distributed under the terms of Creative Commons Attribution 3.0 Unported (CC BY 3.0) Licence.
Except where otherwise noted, this item's license is described as © the Authors, 2015. This is an open access article published by Kauno Technologijos Universitetas and distributed under the terms of Creative Commons Attribution 3.0 Unported (CC BY 3.0) Licence.