Question: Which author has used more pseudonyms, W. E. B. Griffin or Piers Anthony? 
Sentence (from "Apprentice Adept"): But if a person on either world lacks a duplicate (for instance if a Proton citizen immigrated there from another planet, or a counterpart from the opposite frame died), he can cross to the other through an energy "curtain" that circumscribes each frame.
Relevant evidence: No