@article{article1ab17cc3,
title   = {The classifying Lie algebroid of a geometric structure I: classes of coframes},
author = {Fernandes, Rui Loja and Struchiner, Ivan},
year = {2014},
doi = {10.1090/S0002-9947-2014-05973-4},
journal   = {Transactions of the American Mathematical Society}
}