B. Malabadi, Ravindra, Jaime A. Teixeira da Silva, K. Nataraja, S. Vijaya Kumar, and Gangadhar S. Mulgund. 2011. “Induction of Somatic Embryogenesis in Mature Coniferous Forest Trees”. Research in Biotechnology 2 (5). https://updatepublishing.com/journal/index.php/rib/article/view/2374.