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고등과학원 웹출판문 삽화 일러스트<표준기저를 찾아서> https://horizon.kias.re.kr/29695/
Daniel Allcock. "Most big mapping class groups fail the Tits alternative." Algebr. Geom. Topol. 21 (7) 3675 - 3688, 2021. https://doi.org/10.2140/agt.2021.21.3675 (링크: https://msp.org/agt/2021/21-7/p13.xhtml)
Canoing path 출처: Mladen Bestvina, Ryan Dickmann, George Domat, Sanghoon Kwak, Priyam Patel, Emily Stark, Free products from spinning and rotating families. Enseign. Math. 69 (2023), no. 3/4, pp. 235–260 (링크: https://ems.press/journals/lem/articles/11033095)
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