?@Article{Vel2014Des,
author = {Velasco, J. and Ojeda, D. and Hurtado, M. and Chac'{o}n, R.},
title = {Desing of a drill with vacuum tube for extraction brain tumar mass},
journal = {Revista Ingenier'{i}a UC},
year = {2014},
volume = {21},
number = {3},
pages = {65--75},
month = {diciembre},
}