For any number field k, upper bounds are established for the number of k-rational points of bounded height on non-singular del Pezzo surfaces defined over k, which are equipped with suitable conic bundle structures over k.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa163-3-6, author = {Tim Browning and Michael Swarbrick Jones}, title = {Counting rational points on del Pezzo surfaces with a conic bundle structure}, journal = {Acta Arithmetica}, volume = {166}, year = {2014}, pages = {271-298}, zbl = {1318.14021}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa163-3-6} }
Tim Browning; Michael Swarbrick Jones. Counting rational points on del Pezzo surfaces with a conic bundle structure. Acta Arithmetica, Tome 166 (2014) pp. 271-298. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa163-3-6/