1. K. Habiro, Clasper theory and its applications, lecture note at Oiwake seminar, based on notes by S. Fujii, M. Hirasawa, T. Kadokami, A. Akoike, B. Matsuzaka, T. Murakami, Y. Nakagawa, T. Nakatsura, K. Nishizawa, H. Nishihara, A. Shima, T. Shitani, K. Suzuki, Y. Tsujii, Y. Tsutsumi, T. Yagi, Y. Yamada, and T. Yamauchi.
2. Claspers and finite type invariants of links;Habiro;Geom. Topol.,2000
3. A calculus for framed links in S3;Kirby;Invent. Math.,1978
4. An Introduction to Knot Theory;Lickorish,1997
5. W.S. Massey, Higher order linking numbers, in: Conf. on Algebraic Topology (University of Illinois, at Chicago Circle, 1969), University of Illinois at Chicago Circle. pp. 174–205.