1. S. Hilger, Einßmakettenkalkül mit Anwendung auf Zentrumsmannigfaltigkeiten, Ph.D. Thesis, Universität Würzburg, 1988 (in German).
2. Analysis on measure chain-a unified approach to continuous and discrete calculus;Hilger;Results Math.,1990
3. Differential and difference calculus-unified!;Hilger;Nonlinear Anal.,1997
4. Dynamic System on Measure Chains;Kaymakcalan,1996
5. Advances in Dynamic Equations on Time Scales;Bohner,2003