Korčeková, R., E. Gregušková, M. Kmeťová, and M. Janiga. 2015. “In Situ Monitoring of Air Pollutants in the Ružomberok Area - Vascular Plants As Indicators”. Oecologia Montana 24 (2), 50-59. http://om.vuvb.uniza.sk/index.php/OM/article/view/271.