Effective sub-Zechstein salt imaging using low-frequency seismics — Results of the GRUNDY 2003 experiment across the Variscan front in the Polish Basin - Malinowski, M.; Grad, M.; Guterch, A.; Takács, E.; Śliwiński, Z.; Antonowicz, L.; Iwanowska, E.; Keller, G.R.; Hegedűs, E. (Tectonophysics, 2007)