Weighted Moore-Penrose invertible and weighted EP Banach algebra   elements
  The weighted Moore-Penrose inverse will be introduced and studied in the context of Banach algebras. In addition, weighted EP Banach algebra elements will be characterized. The Banach space operator case will be also considered. 
Enrico Boasso, Dragan S. Djordjevic and Dijana Mosic
math.FA