• Study of free vibrations of ladder reiforced with platesArjassov, Gennadi; PetritÅ¡enko, AndresThe 4th International Conference Mechatronics Systems and Materials : MSM 2008 : Bialystok, Poland, 14-17 July, 20082008 / p. 116-117 https://www.researchgate.net/publication/243762343_Study_of_Free_Vibration_of_Ladder_Frames_Reinforced_with_Plate