Improvement of Eustoma grandiflorum (Raf.) Shinn. Cut Flower Quality for Early-Autumn Shipping with Long-Day Treatment Using Light Sources That Delay Flower Bud Formation Yamada, A.; Tanigawa, T.; Suyama, T.; Matsuno, T.; Kunitake, T. Journal of the Japanese Society for Horticultural Science 77(3): 296-303 2008 https://eurekamag.com/research/068/427/068427546.php