Jonczak, Jerzy, i in. „Dynamics of Cu, Mn, Ni, Sr and Zn Release During Decomposition of Four Types of Litter in Headwater Riparian Forests in Northern Poland”. Leśne Prace Badawcze, t. 75, nr 2, czerwiec 2014, s. 193-00, doi:10.2478-frp-2014-0018.