Batzias Siontorou, Fragiskos A.; Siontorou, Christina G. (September 2009). "Measuring Uncertainty in Lichen Biomonitoring of Atmospheric Pollution: The Case of SO2". IEEE Instrumentation and Measurement Society. 58 (9): 3207–3220. doi:10.1109/TIM.2009.2017162. S2CID1139922.
Batzias Siontorou, Fragiskos A.; Siontorou, Christina G. (September 2009). "Measuring Uncertainty in Lichen Biomonitoring of Atmospheric Pollution: The Case of SO2". IEEE Instrumentation and Measurement Society. 58 (9): 3207–3220. doi:10.1109/TIM.2009.2017162. S2CID1139922.