@book{perez-belles_1960, 
  title={CALCULATED REACTIVITY CHANGES PRODUCED BY THE OSCILLATION OF AN EPITHERMAL NEUTRON ABSORBER IN THE BULK SHIELDING REACTOR}, 
  DOI={10.2172/4166970}, 
  institution={Office of Scientific and Technical Information  (OSTI)}, 
  author={Perez-Belles}, 
  year={1960}, 
  month={Apr}
  }