@article{10_4064_cm108_1_2,
     author = {W/lodzimierz Jelonek},
     title = {On certain four-dimensional
 almost {K\"ahler} manifolds},
     journal = {Colloquium Mathematicum},
     pages = {7--18},
     publisher = {mathdoc},
     volume = {108},
     number = {1},
     year = {2007},
     doi = {10.4064/cm108-1-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm108-1-2/}
}