@article{10_4064_fm198_3_3,
     author = {Sergio Fratarcangeli},
     title = {A first-order version of {Pfaffian} closure},
     journal = {Fundamenta Mathematicae},
     pages = {229--254},
     publisher = {mathdoc},
     volume = {198},
     number = {3},
     year = {2008},
     doi = {10.4064/fm198-3-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm198-3-3/}
}