# Original proof of the existence of Seifert surfaces

I read on Wikipedia that Frankl and Prontrjagin were the first to prove that a link $\mathbb{R}^3$ bounds a surface. A few years later Seifert published a proof using the "Seifert algorithm" which seems to be the proof preferred in text books on knot theory. I was wondering if anyone knows an English reference for the original proof or any information about its flavor. Thank you for your time.

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