ARRĐoković, JelenaNikolić, RužicaBujnak, Jan2023-12-252023-12-2520151877-705810.1016/j.proeng.2015.07.068http://www.sciencedirect.com/science/article/pii/S187770581501317Xhttps://repozitorijum.tfbor.bg.ac.rs/handle/123456789/1013enWorking life of the I-beam with crackarticle