@article{BUMI_2000_8_3B_3_a15,
     author = {Gutan, Marin},
     title = {Good and very good magnifiers},
     journal = {Bollettino della Unione matematica italiana},
     pages = {793--810},
     publisher = {mathdoc},
     volume = {Ser. 8, 3B},
     number = {3},
     year = {2000},
     zbl = {0978.20029},
     mrnumber = {1245487},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2000_8_3B_3_a15/}
}