@techreport{Wait1964,
author={Wait, J. R. AND Spies, K. P.},
title={Characteristics of the Earth-ionosphere waveguide for VLF radio waves},
type={Tech note},
number={300},
volume={},
pages={},
year={1964},
institution={National Bureau of Standards},
address={Boulder, Colorado},
abstract={}
}

@ARTICLE{Wilson1925,
        AUTHOR  =       {Wilson, C. T. R.},
        TITLE   =       {The electric field of a thundercloud and some of its
effects},
        JOURNAL =       {Proc. Phys. Soc. London},
        YEAR    =       {1925},
                VOLUME  =       {37},
                NUMBER  =       {},
                MONTH   =       {},
                PAGES   =       {32D--37D},
                NOTE    =       {},
                        KEYWORDS =      {theory, conventional breakdown,
sprite}
}