Nadeem, M., Akond, M., Riaz, A., Qasim, M., Younis, A., & Farooq, A. (2013). Pollen morphology and viability relates to seed productionin hybrid roses. Plant Breeding and Seed Science, 68, 25–38. Retrieved from http://ojs.ihar.edu.pl/index.php/pbss/article/view/291