Krudnak, A., N. Muangsan, and T. Machikowa. “High frequency callus induction through anther culture in high oil sunflower (Helianthus annuus L.)”. Asia-Pacific Journal of Science and Technology, vol. 18, no. 1, Apr. 2017, pp. 62-72, https://so01.tci-thaijo.org/index.php/APST/article/view/82815.