@article{SIGMA_2022_18_a59,
     author = {Rui Dong},
     title = {The {Gauge} {Group} and {Perturbation} {Semigroup} of an {Operator} {System}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2022},
     volume = {18},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2022_18_a59/}
}