Associated production of a top quark pair with a heavy electroweak gauge boson at NLO+NNLL accuracyAnna Kulesza, Leszek Motyka, Daniel Schwartländer, Tomasz Stebel and Vincent TheeuwesEur. Phys. J. C, 79 3 (2019) 249DOI: https://doi.org/10.1140/epjc/s10052-019-6746-z