@article{SIGMA_2016_12_a90,
     author = {Mikhail B. Sheftel and Devrim Yazici},
     title = {Recursion {Operators} and {Tri-Hamiltonian} {Structure} of the {First} {Heavenly} {Equation} of {Pleba\'nski}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2016},
     volume = {12},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2016_12_a90/}
}