Hartikainen, H., Ekholm, P., Piironen, V., Xue, T., Koivu, T., & Yli-Halla, M. (1997). Quality of the ryegrass and lettuce yields as affected by selenium fertilization. Agricultural and Food Science, 6(5-6), 381–387. https://doi.org/10.23986/afsci.72801