1. Theory of vector-valued differential forms II;Frölicher;Kon. Nederl. Akad. Wetensch. Proc. A 61 =Indag. Math,1958
2. The cohomology structure of an associative ring;Gerstenhaber;Ann. of Math.,1963
3. The graded Lie algebras of an algebra;Nijenhuis;Kon. Nederl. Akad. Wetensch. Proc. A 70 =Indag. Math,1967
4. Cohomology and déformations of algebraic structures;Nijenhuis;Bull. Amer. Math. Soc,1964
5. Cohomology and déformations in graded Lie algebras;Nijenhuis;Bull. Amer. Math. Soc,1966