@article{article98b02965,
title   = {Correlation between activation of the sympathetic nervous system estimated by plasma concentrations of norepinephrine and Doppler echocardiographic variables in dogs with acquired heart disease},
author = {Santos, Mário Marcondes dos and Strunz, Célia Maria Cassaro and Larsson, Maria Helena Matiko Akao},
year = {2006},
doi = {10.2460/ajvr.67.7.1163},
journal   = {American Journal of Veterinary Research}
}