참고문헌
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G. T. Jin, S. Lee, S. Oh and M. Teragaito,
$P^2$ -reducing and toroidal Dehn fillings, Math. Proc. Camb. Philos. Soc. 134 (2003), 271-288. https://doi.org/10.1017/S0305004102006412 - S. Lee, S. Oh and M. Teragaito, Reducing Dehn fillings and small surfaces, Proc. London Math. Soc. (3) 92 (2006), 203-223. https://doi.org/10.1017/S002461150501542X