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Many theories beyond the Standard Model predict new phenomena, such as heavy vector bosons and vector-like quarks, in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The recent results obtained with data from the ATLAS experiment from proton-proton collisions at a center-of-mass energy of 13 TeV, along with the associated improvements in identification techniques of third generation quarks, will be reported.