On the displacements of Einsteinian fields et cetera
  I give here: i) a very simple proof that the physical non-existence of gravitational waves (GW's) is quite consistent with the basic principles of general relativity (GR); ii) a new argument against the physical existence of GW's; iii) a criticism of Fock's treatment of the GW's; iv) some remarks on recent experimental investigations concerning the GW's. 
A. Loinger (Dipartimento di Fisica, Universita' di Milano, Italy)