Georgieva, Natalia, Ivelina Nikolova, Valentin Kosev, and Yordanka Naydenova. 2017. “In Vitro Germination and Viability of Pea Pollen Grains After Application of Organic Nano-Fertilizers”. Pesticides and Phytomedicine / Pesticidi I Fitomedicina 32 (1). https://doi.org/10.2298/pif.v32i1.12862.