On the velocity of the Vela pulsar
  It is shown that if the shell of the Vela supernova remnant is responsible for nearly all the scattering of the Vela pulsar, then the scintillation and proper motion velocities of the pulsar can only be reconciled with each other in the case of nonzero transverse velocity of the scattering material. A possible origin of large-scale transverse motions in the shell of the Vela supernova remnant is discussed. 
Vasilii Gvaramadze (Abastumani Astrophysical Observatory, Tbilisi,   Georgia)