Georgieva, N., I. Nikolova, V. Kosev, and Y. Naydenova. “In Vitro Germination and Viability of Pea Pollen Grains After Application of Organic Nano-Fertilizers”. Pesticides and Phytomedicine / Pesticidi I Fitomedicina, Vol. 32, no. 1, May 2017, doi:10.2298/pif.v32i1.12862.