Geodesic
Structure of the second homotopy group of the union of two spaces
Zapiski Nauchnykh Seminarov POMI, Investigations in topology. Part V, Tome 143 (1985), pp. 147-155

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In this paper we give a representation of the two-dimensional homotopy group of the union of two spaces as a suitable quotient-group and some applications of it. 
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     author = {S. V. Matveev},
     title = {Structure of the second homotopy group of the union of two spaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {147--155},
     publisher = {mathdoc},
     volume = {143},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_143_a7/}
}
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S. V. Matveev. Structure of the second homotopy group of the union of two spaces. Zapiski Nauchnykh Seminarov POMI, Investigations in topology. Part V, Tome 143 (1985), pp. 147-155. http://geodesic.mathdoc.fr/item/ZNSL_1985_143_a7/