Geodesic
Quasiself-dual fields in $N=4$ supersymmetric Yang--Mills theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 77 (1988) no. 3, pp. 340-351

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In Euclidean conformally invariant Yang–Mills theory with sextuplet of scalar fields – the bosonic sector of $N=4$ supersymmetric Yang–Mills theory – a general representation of the quasiself-dual gauge field in terms of the multiplet of scalar fields is found. In the case of $O(4)$ symmetry the model generates a Hamiltonian system with two degrees of freedom, for which a description of the quasiselfdual fields in the framework of the Hamilton–Jacobi method is obtained. An explicit example of a quasi-instanton in the region $g^20$ is constructed. 
@article{TMF_1988_77_3_a2,
     author = {V. A. Yatsun},
     title = {Quasiself-dual fields in $N=4$ supersymmetric {Yang--Mills} theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {340--351},
     publisher = {mathdoc},
     volume = {77},
     number = {3},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_77_3_a2/}
}
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V. A. Yatsun. Quasiself-dual fields in $N=4$ supersymmetric Yang--Mills theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 77 (1988) no. 3, pp. 340-351. http://geodesic.mathdoc.fr/item/TMF_1988_77_3_a2/