Seijo Coello, M. D. C., V. Jato Rodriguez, and M. J. Aira Rodri?guez. “Intra-Annual Variations of the Pollen Spectrum of Honey from Nogueira De Ramuín (Orense)”. Acta Botanica Malacitana, vol. 17, Dec. 1992, pp. 175-82, doi:10.24310/abm.v17i.9029.