Nguetseng Gabriel: Absorptive continuous R-group actions on locally compact spaces. In: Acta scientiarum mathematicarum, (77) 3-4. pp. 633-667. (2011)
Nguetseng Gabriel: Mean value on locally compact abelian groups. In: Acta scientiarum mathematicarum, (69) 1-2. pp. 203-221. (2003)