K.Baceva, T.Stafilov, R.Sajn, C.Tanaselia, 2012. Moss biomonitoring of air pollution with heavy metals in the vicinity of a ferronickel smelter plant. J Environ Sci Health Environ Sci Eng, 47(4), pp. 645-656, ISSN 1093-4529, doi: 10.1080/10934529.2012.650587.