Authors
Aleksejs Nipers
Latvia University of Life Sciences and Technologies, Jelgava, Latvia
Irina Pilvere
Latvia University of Life Sciences and Technologies, Jelgava, Latvia
© 2020 Aleksejs Nipers, Irina Pilvere, published by Latvia University of Life Sciences and Technologies
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.