@misc{optimal+modelling+of+steel+multi+span+beams+using+the+gradient+iterative+method,
    author = {Mikulski, Leszek},
    title = {Optimal Modelling of Steel Multi-Span Beams Using the Gradient-Iterative Method},
    journal = {Civil and Environmental Engineering Reports},
    address = {Zielona Góra},
    publisher = {CEER, University of Zielona Góra, Institute of Building Engineering},
    date = {2019},
    number = {No. 29, Vol. 4},
    ISSN = {2080-5187}
}