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Title: Not worth it
Review: This is a brief article that provides less information than I found in a few minutes of searching the internet. The formulas are presented in algebraic format with the variables and constants poorly defined. The constants for typical materials and applications are not found in the article. All of the figures have been ommitted so any references to those figures are pointless. I found this article pretty dissapointing. I wasted my money - save yours!
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