Tsegay, B. A., Lund, L., Nilsen, J., Olsen, J. E., Molmann, J. M., Ernsten, A., & Juntttila, O. (2005). Growth responses of Betula pendula ecotypes to red and far-red light. Electronic Journal of Biotechnology, 8(1), 0–0. Retrieved from https://www.ejbiotechnology.info/index.php/ejbiotechnology/article/view/v8n1-10