C. R. Spehar and P. I. de M. de Souza, “Adapting the quinoa (Chenopodium quinoa Willd.) to cultivation in the brazilian highlands: preliminary results”, PAB, vol. 28, no. 5, pp. 635–639, May 1993, doi: 10.1590/S1678-3921.pab1993.v28.3920.