@misc{stiffness+nonlinear+analysis+of+sections+for+reinforced+concrete+members, author = {Zdanowicz, Łukasz i Noakowski, Piotr}, title = {Stiffness nonlinear analysis of sections for reinforced concrete members}, journal = {Technical Transactions}, address = {Kraków}, publisher = {Wydawnictwo PK}, date = {2013}, number = {Y. 110, iss. 2-B} }