Geodesic
A Homotopy theory to classify singular links
Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 1, Tome 193 (1991), pp. 101-118 
V. M. Nezhinskiy. A Homotopy theory to classify singular links. Zapiski Nauchnykh Seminarov POMI, Geometry and topology. Part 1, Tome 193 (1991), pp. 101-118. http://geodesic.mathdoc.fr/item/ZNSL_1991_193_a6/
@article{ZNSL_1991_193_a6,
     author = {V. M. Nezhinskiy},
     title = {A {Homotopy} theory to classify singular links},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {101--118},
     year = {1991},
     volume = {193},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1991_193_a6/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The aim of this work is to transfer a concept of absolute homotopy groups from topological spaces to space pairs, to reduce in some cases the problem of computing these groups to the standard algebro-homotopic problems and to explain how the results obtained can be applied to the theory of singular links.