@article{SM_2003_194_5_a1,
     author = {M. M. Grinenko},
     title = {Birational properties of pencils of del {Pezzo} surfaces of~degrees~1 {and~2.~II}},
     journal = {Sbornik. Mathematics},
     pages = {669--695},
     publisher = {mathdoc},
     volume = {194},
     number = {5},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_5_a1/}
}