Geodesic
Some classification problems in four-dimensional geometry: distributions, almost complex structures, and generalized Monge--Ampere equations
Sbornik. Mathematics, Tome 189 (1998) no. 11, pp. 1643-1656

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Three related classification problems on four-manifolds are discussed. First, regular distributions are considered and described locally. After that a classification of almost complex structures of general position in terms of distributions is proposed. Finally, non-degenerate generalized Monge–Ampere equations are classified in terms of $\{e\}$-structures. Symplectic Lie algebras are also considered in an appendix. 
@article{SM_1998_189_11_a2,
     author = {B. S. Kruglikov},
     title = {Some classification problems in four-dimensional  geometry: distributions, almost complex structures, and generalized {Monge--Ampere} equations},
     journal = {Sbornik. Mathematics},
     pages = {1643--1656},
     publisher = {mathdoc},
     volume = {189},
     number = {11},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1998_189_11_a2/}
}
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B. S. Kruglikov. Some classification problems in four-dimensional  geometry: distributions, almost complex structures, and generalized Monge--Ampere equations. Sbornik. Mathematics, Tome 189 (1998) no. 11, pp. 1643-1656. http://geodesic.mathdoc.fr/item/SM_1998_189_11_a2/