Janas, M., & Sokół-Supel, J. (1999). On the strength reserve of concrete structures due to conditions of restrained flexure/Apie betoninų konstrukcių stiprumo rezervą suvaržyto lenkimo sąlygomis. Journal of Civil Engineering and Management, 5(6), 399-404. https://doi.org/10.3846/13921525.1999.10531495