A. K. BASWAL, et al. “ASSESSMENT OF POLLEN VIABILITY AND FLORAL BIOLOGY IN SWEET ORANGE (CITRUS SINENSIS OBSECK) CULTIVARS UNDER SUBTROPICAL CONDITIONS OF PUNJAB”. The Bioscan, vol. 10, no. 4, Dec. 2015, pp. 1573-6, https://thebioscan.com/index.php/pub/article/view/1433.