Comment on the article ``UCN anomalous losses and the UCN capture cross   section on material defects'' by A. Serebrov et al
  We present correct solution of the problem about a scattering of the neutron on a point-like defect existing in a medium and show that this mechanism cannot explain anomalous losses of UCN in storage bottles. 
A.L. Barabanov, K.V. Protasov