Hagner, Marleena, Olli-Pekka Penttinen, Tiina Pasanen, Kari Tiilikkala, and Heikki Setälä. 2010. “Acute Toxicity of Birch Tar Oil on Aquatic Organisms”. Agricultural and Food Science 19 (1):24-33. https://doi.org/10.2137/145960610791015023.