Compact Six-Dimensional Kähler Spin Manifolds of Positive Scalar Curvature with the Smallest Possible First Eigenvalue of the Dirac Operator. K.-D. Kirchberg — 1988 Mathematische Annalen
Properties of Kählerian twistor-spinors and vanishing theorems. K.-D. Kirchberg — 1992 Mathematische Annalen
Complex Contact Structures and the First Eigenvalue of the Dirac Operator on Kähler Manifolds. K.-D. Kirchberg; U. Semmelmann — 1995 Geometric and functional analysis