@article{Hess:129261,
title = {A history of rational homotopy theory},
author = {Hess, Kathryn},
publisher = {Elsevier Science B.V.},
journal = {History of Topology},
pages = {757-796},
year = {1999},
abstract = {Rational homotopy theory is the study of topological spaces “modulo torsion”. When rational homotopy theorists calculate algebraic invariants of a topological space, such as its homotopy or homology groups, they retain only the nontorsion information. Algebraic models of topological spaces are the most important tools of the rational homotopy theorist.},
}