PARHIZGAR, Mohammad. On the cohomology ring of the free loop space of a wedge of spheres. Mathematica Scandinavica, Berkeley, CA, United States, v. 80, p. 195–248, 1997. DOI: 10.7146/math.scand.a-12619. Disponível em: https://journals.msp.org/mscand/article/view/1011. Acesso em: 24 jul. 2026.