1. Homotopy, concordance and bordism of link maps;Koschorke,1993
2. Link groups;Milnor;Ann. Math.,1954
3. Higher order homotopy invariants for higher dimensional link maps;Koschorke,1985
4. Link homotopy with many components;Koschorke;Topology,1991
5. Invariants of links of codimensions greater than two;Turaev,1977