Full article, <a href="https://www.wisdom.weizmann.ac.il/~harel/SCANNED.PAPERS/OnFolkTheorems.pdf" rel="nofollow">https://www.wisdom.weizmann.ac.il/~harel/SCANNED.PAPERS/OnFo...</a>
Alternative full PDF link from scihub <a href="https://sci-hub.hkvisa.net/10.1145/358886.358892" rel="nofollow">https://sci-hub.hkvisa.net/10.1145/358886.358892</a>