DRAGOMIR, Ștefan, et Marian BORDEI. Evaluated Work System and Environmental Risk for a Worker in Drilling for Methane Gas. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 38, no. 1 (mars 15, 2015): 61-65. Consulté le octobre 9, 2025. https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/1374.