Bibliography

1. http://en.wikipedia.org/wiki/Sphere_lightning#External_links

2. http://www.tumblr.com/tagged/ball-lightning?before=1313985383

3. http://paranormal.about.com/

4. http://www.eskimo.com/~billb/tesla/ballgtn.html

5. Appendices

1 http://www.eskimo.com/~billb/tesla/ballgtn.html

2 http://paranormal.about.com/

3 http://en.wikipedia.org/wiki/Ball_lightning

4 http://en.wikipedia.org/wiki/Ball_lightning

5 http://en.wikipedia.org/wiki/Ball_lightning

6 http://en.wikipedia.org/wiki/Ball_lightning

7 http://www.tumblr.com/tagged/ball-lightning?before=1313985383

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