Galambosi, B., ZS. Szebeni-Galambosi, M. Repcak, and P. Cernaj. 1991. “Variation in the Yield and Essential Oil of Four Chamomile Varieties Grown in Finland in 1985—1988”. Agricultural and Food Science 63 (5):403-10. https://doi.org/10.23986/afsci.72419.