1. Über eine Methode zur Lösung von linearen Differentialgleichungen mit Hilfe von Lie-Reihen;Mennig,1965
2. Über die Anwendung von Rekursionsformeln bei der Lie-Reihen-Methode;Mennig;Acta Phys. Austriaca,1964
3. The solution of ordinary differential equations by means of Lie series;Mennig;EIR-114,1967
4. The application of Lie series to reactor theory;Mennig;Nucl. Sci. Engrg.,1967
5. Integration of differential equations by means of Lie series and various numerical methods: Comparison of speed and reliability;Mennig;IAEA-SM-154,1972