@article{10_4064_fm172_1_5,
     author = {Tarek Sayed Ahmed},
     title = {The class of 2-dimensional neat reducts is not elementary},
     journal = {Fundamenta Mathematicae},
     pages = {61--81},
     publisher = {mathdoc},
     volume = {172},
     number = {1},
     year = {2002},
     doi = {10.4064/fm172-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm172-1-5/}
}