@mastersthesis{mastersthesisdd6fdc27,
title   = {Obstruction theory, characteristic classes and applications},
author = {Martins, Edmundo Bernardo de Castro and Grulha Júnior, Nivaldo de Góes},
year = {2022},
doi = {10.11606/D.55.2022.tde-13022023-152723},
school = {Universidade de São Paulo}
}