@article{GDZPPN002335964, title = {Elliptic surfaces with four singular fibres.}, journal = {Mathematische Annalen}, volume = {291}, year = {1991}, pages = {319-342}, zbl = {0762.14018}, url = {http://dml.mathdoc.fr/item/GDZPPN002335964} }
Herfurtner, Stephan. Elliptic surfaces with four singular fibres.. Mathematische Annalen, Tome 291 (1991) pp. 319-342. http://gdmltest.u-ga.fr/item/GDZPPN002335964/