@article{SIGMA_2021_17_a90,
     author = {Andrei K. Pogrebkov},
     title = {Negative {Times} of the {Davey{\textendash}Stewartson} {Integrable} {Hierarchy}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2021},
     volume = {17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2021_17_a90/}
}