Андрющенко, А.В., Лещук, Н.В. and Скрипка, А.І. 2006. The forming of lettucc variety examples collection ( Lactuca sativa L. ). Plant varieties studying and protection. 1 (Mar. 2006), 49–54. DOI:https://doi.org/10.21498/2518-1017.1.2005.66842.