@misc{optimal+modelling+of+prestressed+girders+using+the+gradient+iterative+method, author = {Sobczyk, Szymon}, title = {Optimal modelling of prestressed girders using the gradient-iterative method}, journal = {Technical Transactions}, address = {Kraków}, publisher = {Wydawnictwo PK}, date = {2013}, number = {Y. 110, iss. 3-B} }