On the area operators of the Husain-Kuchar-Rovelli model and   Canonical/Loop Quantum Gravity
  I investigate the relation between an operative definition of the area of a surface specified by matter fields and the area operators recently introduced in the canonical/loop approach to Quantum Gravity and in Rovelli's variant of the Husain-Kuchar Quantum-Gravity toy model. The results suggest that the discreteness of the spectra of the area operators might not be observable. 
Giovanni Amelino-Camelia