1. [1] R Budney, J Conant, K P Scannell, D Sinha, New perspectives on self-linking. Adv. Math. 191.1 (2005), 78–113.
2. [2] J C Cha, Link concordance, homology cobordism, and Hirzebruch-type defects from iterated p-covers, J. Eur. Math. Soc. 12 (2010) 555–610.
3. [3] J C Cha, Rational Whitney tower filtration of links, Mathematische Annalen (2017) 1–30.
4. [4] J C Cha, K Orr,Transfinite Milnor invariants for 3-manifolds, preprint (2020). arXiv:2002.03208 [math.GT]
5. [5] T Cochran, Derivatives of links, Milnor’s concordance invariants and Massey products, Mem. Amer. Math. Soc. Vol. 84 No. 427 (1990).