1. Antolik K (1875) Das Gleiten elektrischer Funken. Pogg Ann Phys Chem 1:14?37
2. Blackmore JT (1972) Ernst Mach ? his work, life, and influence. Univ Calif Press, Berkeley Los Angeles London
3. Cole RH (1965) Underwater explosions. Dover Publications, New York, pp 255?258
4. Cornish V (1910) Waves of the sea and other water waves. T Fisher Unwin, London, frontispiece and pp 173
5. Courant R, Friedrichs KO (1948) Supersonic flow and shock waves. Interscience Publishers, New York, pp 335?350