Maziarz, P., Prokop, A., & Matusik, J. (2015). A comparative study on the removal of Pb(II), Zn(II), Cd(II) and As(V) by natural, acid activated and calcined halloysite. Geology, Geophysics and Environment, 41(1), 108. https://doi.org/10.7494/geol.2015.41.1.108