Koch, U., and J. Heinicke. “Hydrological Influences on Long-Term Gas Flow Trends at Locations in the Vogtland/NW Bohemian Seismic Region (German-Czech Border)”. Annals of Geophysics 50, no. 4 (December 25, 2007). Accessed December 1, 2021. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3069.