Grisha Perelman. "The entropy formula for the Ricci flow and geometric applications". https://arXiv.org/abs/math/0211159/. This site's abbreviation [P. E]
Grisha Perelman. "Finite extinction time for the solution to the Ricci flow on certain three-manifolds". https://arXiv.org/abs/math/0307245/. This site's abbreviation [P. F]
Grisha Perelman. "Spaces with curvature bounded below" Proceedings of ICM-1994, pp 517-525. This site's abbreviation [P. S]