Mollaei, M., S. A. Hoseini, M. Karimi, and Z. Hekmat. 2013. “Short Communication. Impact of the Amino Acid Proline on the Cold Hardiness of Honey Bee, Apis Mellifera L.”. Spanish Journal of Agricultural Research 11 (3), 714-17. https://doi.org/10.5424/sjar/2013113-3842.