@article{article666da3eb,
title   = {Niobium(V) oxide: a new and efficient catalyst for the transesterification of 'beta-keto' esters},
author = {Sairre, Mirela Inês and Uhle-Bronze, Érika Soares and Donate, Paulo Marcos},
year = {2005},
doi = {10.1016/j.tetlet.2005.01.158},
journal   = {Tetrahedron Letters}
}