Oksanen, I., Jokela, J., Fewer, D. P., Wahlsten, M., Rikkinen, J., & Sivonen, K. (2004). Discovery of Rare and Highly Toxic Microcystins from Lichen-Associated Cyanobacterium Nostoc sp. Strain IO-102-I. American Society for Microbiology.

Oksanen, Ilona, Jouni Jokela, David P. Fewer, Matti Wahlsten, Jouko Rikkinen, and Kaarina Sivonen. Discovery of Rare and Highly Toxic Microcystins From Lichen-Associated Cyanobacterium Nostoc Sp. Strain IO-102-I. American Society for Microbiology, 2004.

Oksanen, Ilona, et al. Discovery of Rare and Highly Toxic Microcystins From Lichen-Associated Cyanobacterium Nostoc Sp. Strain IO-102-I. American Society for Microbiology, 2004.