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. 
@article{ZNSL_2003_299_a19,
     author = {V. M. Nezhinskii and Yu. V. Petrova},
     title = {Singular links of two circles and a~wedge of circles in the 3-sphere},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {295--299},
     publisher = {mathdoc},
     volume = {299},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2003_299_a19/}
}
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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/