Giehl, Carlo Juliantro, et al. “Azolla Production As a Protein Source to Poultry: A Case Study in Family Poultry Farmers in Rio Grande Do Sul, Brazil”. Revista Verde De Agroecologia E Desenvolvimento Sustentável, vol. 16, no. 3, July 2021, pp. 321-5, doi:10.18378/rvads.v16i3.8314.