@article{article1a9aa3a5,
title   = {An efficient synthesis of 3-hydroxychromone using niobium pentachloride},
author = {Constantino, Maurício Gomes and Lacerda Júnior, Valdemar and Silva, Gil Valdo José da},
year = {2003},
doi = {10.1002/jhet.5570400229},
journal   = {Journal of Heterocyclic Chemistry}
}