d'Obyrn, Kajetan, and Adam Postawa. “Selected Hydrochemical Ratios of Waters from Inflows at Level VI in ‘Wieliczka’ Salt Mine”. Geology, Geophysics and Environment, vol. 39, no. 3, Sept. 2013, p. 163, https://doi.org/10.7494/geol.2013.39.3.163.