@article{fock:1945:drw,
    author = {Fock, V.},
     title = {Diffraction of radio waves around the earth's surface},
   journal = {Acad. Sci. USSR. J. Phys.},
    volume = {9},
      year = {1945},
     pages = {255–266},
   mrclass = {78.0X},
  mrnumber = {MR0014332 (7,270j)},
     zblno = {0063.01395}}