@article{SM_2000_191_5_a1,
     author = {M. M. Grinenko},
     title = {Birational properties of pencils of del {Pezzo} surfaces of degrees 1 and~2},
     journal = {Sbornik. Mathematics},
     pages = {633--653},
     year = {2000},
     volume = {191},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2000_191_5_a1/}
}