TY  - JOUR
TI  - Free vibration analysis of helicoidal bars with thin- walled circular tube cross-section via mixed finite element method
AU  - ERATLI, N.
AU  - ERMİŞ, M.
AU  - OMURTAG, M.H.
JO  - Sigma Journal of Engineering and Natural Sciences
PY  - 2015
VL  - 33
SP  - 200
EP  - 218
DO  - 
ER  -