If you're looking for a PDF of Federer's "Geometric Measure Theory," you may be able to find it through online repositories or academic databases, such as:
Federer and Geometric Measure Theory:
No. There is no serious mathematical paper proving that Roger Federer’s backhand minimizes surface area. federer geometric measure theory pdf
Searching "Federer geometric measure theory pdf" on public engines will return either Herbert’s legitimate (paywalled) book or tennis articles. Do not expect a PDF combining Roger’s photos with integral geometry. If you're looking for a PDF of Federer's