Frank Westerman Dutchman wrote a book about the Lipik Lipizzaners

http://www.croatia.org/crown/articles/10085/1/Frank-Westerman-Dutchman-wrote-a-book-about-the-Lipik-Lipizzaners.html
While waiting for Brother Mendel's Perfect Horse to make its appearance in English language we can read about it.

Note: the spelling of the name of the breed is different. From Westerman's web page: “When you touch a Lippizaner,” Frank Westerman was told as a child, “you are touching history.”

Are they both accepted as correct?

Regards,

marisela