On PSR1913+16
  There are reference frames for which both stars of binary radio-pulsar PSR1913+16 are at rest. As a consequence, PSR1913+16 does not emit gravity waves. (If the accelerated bodies should send out a gravitational radiation, they would represent a class of physically privileged systems. But this is forbidden by general relativity.) 
A.Loinger (Dipartimento di Fisica, Universita' di Milano, Italy)