@mastersthesis{mastersthesisc7d283c1,
title   = {Sobre o proper forcing axiom},
author = {Junqueira, Lucia Renato and Alas, Ofélia Teresa},
year = {1990},
doi = {10.11606/D.45.1990.tde-20210728-232220},
school = {Universidade de São Paulo}
}