Geodesic
Coincidence Theory: The Minimizing Problem
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Solitons, geometry, and topology: on the crossroads, Tome 225 (1999), pp. 52-86

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We provide a short history of the main contributions about the problem of computing the minimal coincidence number $MC[f_1,f_2]$ where $(f_1,f_2)$ is a pair of maps between two topological spaces and where these maps can be homotopically deformed. The more recent contributions are treated in more detail, including some material not yet published. 
@article{TM_1999_225_a4,
     author = {S. A. Bogatyi and D. L. Gon\c{c}alves and H. Zieschang},
     title = {Coincidence {Theory:} {The} {Minimizing} {Problem}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {52--86},
     publisher = {mathdoc},
     volume = {225},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1999_225_a4/}
}
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S. A. Bogatyi; D. L. Gonçalves; H. Zieschang. Coincidence Theory: The Minimizing Problem. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Solitons, geometry, and topology: on the crossroads, Tome 225 (1999), pp. 52-86. http://geodesic.mathdoc.fr/item/TM_1999_225_a4/