1. Laboratory of Virology, Department of Natural Sciences, New Bulgarian University, Sofia, Bulgaria
2. Department of Plant Protection, Institute of Soil Science, Agrotechnologies and Plant Protection “N. Pushkarov”, Agricultural Academy, Sofia, Bulgaria
3. Plant Biotechnology Laboratory, Department of Biotechnology, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur, Uttar Pradesh, India