Ziemelis, I., Putāns, H., Iljins, U., & Ķikāns, A. (2001). POSSIBILITIES FOR USING SOLAR ENERGY TOHEAT LOCAL WARMING OF NEW BORN PIGLETS.
ENVIRONMENT. TECHNOLOGY. RESOURCES. Proceedings of the International Scientific and Practical Conference,
1, 221-229.
https://doi.org/10.17770/etr2001vol1.1966