Krarup H., Aage, Daniela Mann P., Ricardo Stevens S., and Claudio Flies L. “Daily Elongation and Height of Spear Opening of Twenty-Eight Asparagus Genotypes”. Agro sur 25, no. 1 (June 30, 1997): 16–23. Accessed July 18, 2024. http://revistas.uach.cl/index.php/agrosur/article/view/3740.