An asymptotic formula is established for the number of -rational points of bounded height on a nonsingular quartic Del Pezzo surface with a conic bundle structure.
"Manin’s conjecture for quartic Del Pezzo surfaces with a conic fibration." Duke Math. J. 160 (1) 1 - 69, 1 October 2011. https://doi.org/10.1215/00127094-1443466