1. Agostinelli, C., & Lund, U. (2013). R package ‘circular’: Circular statistics (version 0.4-7).
https://r-forge.r-project.org/projects/circular/
. Accessed 1 Dec 2017.
2. Alba, F., de la Guardia, C. D., & Comtois, P. (2000). The effect of meteorological parameters on diurnal patterns of airborne olive pollen concentration. Grana,
39, 200–208.
3. Alcázar, P., Galán, C., Cariñanos, C., & Domínguez-Vilches, E. (1999). Diurnal variation of airborne pollen at two different heights. Journal of Investigational Allergology and Clinical Immunology,
9(2), 89–95.
4. Beddows, A. R. (1931). Seed-setting and flowering in various grasses. Report no. series H no. 12, Welsh Plant Breeding Station Bulletin.
5. Bogawski, P., & Smith, M. (2016). Pollen nightmare: Elevated airborne pollen levels at night. Aerobiologia, 32(4), 725–728.