@article{NSJOM_1979_9_Nonea_20,
     author = {Acketa Dragan},
     title = {On the construction of all 

 matroids on 7 elements at most},
     journal = {Novi Sad Journal of Mathematics},
     pages = {133-152},
     publisher = {mathdoc},
     volume = {9},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1979_9_Nonea_20/}
}