Geodesic
Singular links of two circles and a wedge of circles in the 3-sphere
Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 8, Tome 299 (2003), pp. 295-299
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A homotopy classification of singular links of two circles and a wedge of circles in the 3-sphere is given. This result generalizes Milnor's one on homotopy classification of classical three-component links. 
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V. M. Nezhinskii; Yu. V. Petrova. Singular links of two circles and a wedge of circles in the 3-sphere. Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 8, Tome 299 (2003), pp. 295-299. http://geodesic.mathdoc.fr/item/ZNSL_2003_299_a19/

[1] J. P. Levine, “An approach to homotopy classification of links”, Trans. Am. Math. Soc., 306:1 (1988), 361–387 | DOI | MR | Zbl

[2] J. Milnor, “Link groups”, Ann. of Math. (2), 59 (1954), 177–195 | DOI | MR | Zbl

[3] A. Skopenkov, “On the generalized Massey–Rolfsen invariant for link maps”, Fundamenta Math., 165 (2000), 1–15 | MR | Zbl