Wiktorowski, Damian, et al. “Dendrogeomorphological Analysis of Landslide Activity Along the Planned S-69 Road in the Węgierska Górka Municipality (Beskid Śląski Mountains, S Poland)”. Geology, Geophysics and Environment, vol. 43, no. 2, Jan. 2018, p. 139, https://doi.org/10.7494/geol.2017.43.2.139.