If you are looking for a technical report on her training methods, it is likely contained in her own published books or DVDs rather than a formal research paper. To help you find the right information, could you clarify:
If this topic refers to a specific local event, a piece of fiction, or a private document, could you please provide more , such as the of origin or the specific field Petra Biehle And Horse 52
There is no public record of an equestrian or horse trainer named Petra Biehle , nor a specific notable animal known as "Horse 52." If you are looking for a technical report