M. Keshlaf and  R. Spooner-Hart,  Effects of Modified Bottom Boards on the Performance of Honeybee Colonies.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 25 - 28
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/9997263.