Paliya, V. S.Bottcher, M.Diltz, C.Stalin, C. S.Sahayanathan, S.Ravikumar, C. D.2016-02-042016-02-042015Astrophysical Journal, 2015. Vol. 811 (2): pp. 1-7: Article no. 143http://hdl.handle.net/123456789/123125030 bytestext/htmlengalaxies: activegalaxies: jetsquasars: individual (Mrk 421)X-rays: galaxiesThe violent hard X-ray variability of MRK 421 observed by NuSTAR in 2013 AprilArticle