VECMAtk: A Scalable Verification, Validation and Uncertainty Quantification Toolkit for Scientific Simulations. - Derek Groen; Hamid Arabnejad; Vytautas Jancauskas; Wouter Edeling; Fredrik Jansson; Robin A. Richardson; Jalal Lakhlili; Linda van Veen; Bartosz Bosak; Piotr Kopta; D. W. Wright; Nicolas Monnier; et al. (CoRR, 2020)