BLAGA, Andrea Brigita, et al. “LIMONENE IN SCHOOL INDOOR ENVIRONMENTS – SOURCE AND LEVEL OF CONTAMINATION”. Studia Universitatis Babeș-Bolyai Ambientum, vol. 60, no. 1-2, Dec. 2015, pp. 15-22, https://studia.reviste.ubbcluj.ro/index.php/subbambientum/article/view/4287.