Corbet, Sarah A. (2003-01-01). "Nectar sugar content: estimating standing crop and secretion rate in the field" (en). Apidologie34 (1): 1–10. doi:10.1051/apido:2002049. ISSN0044-8435.
Corbet, Sarah A. (2003-01-01). "Nectar sugar content: estimating standing crop and secretion rate in the field" (en). Apidologie34 (1): 1–10. doi:10.1051/apido:2002049. ISSN0044-8435.