Along with 4. Aircraft impact damage, Tomasz Wierzbicki, Liang Xue, Meg Hendry-Brogan, linked from here:
I used the below article in my first blog post
JPEGs, which can be clicked on to enlarge and read or print, are posted for fair use only under the U.S. Code. I promised to do this a while back but have been busy.
This is the article which I think Eric Salter, and Steven Jones in citing Eric Salter, should have acknowledged, as I stated here:
The equations are Greek to me, as I have made clear from the beginning, so comments and questions should be limited to English. Thank you.