@article{article29569281,
title   = {Ultrasound enhanced synthesis of 1,5-benzodiazepinic heterocyclic rings},
author = {Guzen, Karla Pierdoná and Cella, Rodrigo and Stefani, Hélio Alexandre},
year = {2006},
doi = {10.1016/j.tetlet.2006.09.043},
journal   = {Tetrahedron Letters}
}