Ab initio models for multiple-hydrogen exchange: Comparison of cyclic four- and six-center systems. - Dietmar Heidrich; Nicolaas J. R. van Eikema Hommes; Paul von Ragué Schleyer (J. Comput. Chem., 1993)

Searching for saddle points of potential energy surfaces by following a reduced gradient. - Wolfgang Quapp; Michael Hirsch 003; Olaf Imig; Dietmar Heidrich (J. Comput. Chem., 1998)