@article {35100,
	title = {Free vibration analysis of structures with elastic and piezoelectric behaviors using specific hexahedral elements with rotational DOFs.},
	journal = {Acta Mechanica},
	volume = {226},
	year = {2014},
	pages = {1737{\textendash}1756},
	url = {http://dx.doi.org/10.1007/s00707-014-1274-2},
	author = {Zouari W., Assarar M. and Meftah K., Ayad R.}
}
