Forced periodic oscillations in the climate system via an energy balance model Georg Hetzer (1987) Commentationes Mathematicae Universitatis Carolinae
Formules de Lefschetz délocalisées J. M. Bismut (1984/1985) Séminaire Équations aux dérivées partielles (Polytechnique)
Functional integral solution of the complex diffusion equation with complex quadratic potential in a classical path space. Abdul Aziz, Zainal (2001) Bulletin of the Malaysian Mathematical Sciences Society. Second Series