@article{article3c7910b6,
title   = {Ultrasound-assisted extraction of Ca, K and Mg from in vitro citrus culture},
author = {Arruda, S C C and Martinelli, Adriana Pinheiro and Arruda, M A Z},
year = {2003},
doi = {10.1590/s0103-50532003000300023},
journal   = {Journal of the Brazilian Chemical Society}
}