Category weight: new ideas concerning Lusternik-Schnirelmann category Yuli Rudyak (1998) Banach Center Publications
Cohomology C ∞ -algebra and rational homotopy type Tornike Kadeishvili (2009) Banach Center Publications In the rational cohomology of a 1-connected space a structure of C ∞ -algebra is constructed and it is shown that this object determines the rational homotopy type.