Geodesic
Multiple Fibers of del Pezzo Fibrations
Informatics and Automation, Multidimensional algebraic geometry, Tome 264 (2009), pp. 137-151

Voir la notice de l'article provenant de la source Math-Net.Ru

We prove that a terminal three-dimensional del Pezzo fibration has no fibers of multiplicity $>6$. We also obtain a rough classification of possible configurations of singular points on multiple fibers and give some examples. 
@article{TRSPY_2009_264_a15,
     author = {S. Mori and Yu. G. Prokhorov},
     title = {Multiple {Fibers} of del {Pezzo} {Fibrations}},
     journal = {Informatics and Automation},
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     volume = {264},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2009_264_a15/}
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S. Mori; Yu. G. Prokhorov. Multiple Fibers of del Pezzo Fibrations. Informatics and Automation, Multidimensional algebraic geometry, Tome 264 (2009), pp. 137-151. http://geodesic.mathdoc.fr/item/TRSPY_2009_264_a15/