Spin and its evolution for isolated neutron stars and X-ray binaries:   the determination of the 'Diffusion coefficients' and Spindown Theorem
  In this work we give detail consideration of the possible scenario of evolution of isolated neutron stars and determine some characteristics of X-ray pulsars from their spin period evolution (the paper containes more detailed abstract). 
V.M. Lipunov (SAI, MSU) and S.B. Popov (MSU)