The EXTraS project: Exploring the X-ray transient and variable sky (2021) De Luca A, Salvaterra R, Belfiore A, Carpano S, D'Agostino D, Haberl F, Israel GL, et al. Journal article A proto-helium white dwarf stripped by a substellar companion via common-envelope ejection: Uncovering the true nature of a candidate hypervelocity B-type star (2021) Irrgang A, Geier S, Heber U, Kupfer T, El-Badry K, Bloemen S Journal article Potential origin of the state-dependent high-energy tail in the black hole microquasar Cygnus X-1 as seen with INTEGRAL (2021) Cangemi F, Beuchert T, Siegert T, Rodriguez J, Grinberg V, Belmont R, Gouiffès C, et al. Journal article Hubble spectroscopy of LB-1: Comparison with B+black-hole and Be+stripped-star models (2021) Lennon DJ, Maíz Apellániz J, Irrgang A, Bohlin R, Deustua S, Dufton PL, Simón-DÍaz S, et al. Journal article The first GeV flare of the radio-loud narrow-line Seyfert 1 galaxy PKS 2004-447 (2021) Gokus A, Paliya VS, Wagner SM, Buson S, D'Ammando F, Edwards PG, Kadler M, et al. Journal article X-ray emitting structures in the Vela SNR: Ejecta anisotropies and progenitor stellar wind residuals (2021) Sapienza V, Miceli M, Peres G, Bocchino F, Orlando S, Greco E, Combi JA, et al. Journal article Multiwavelength analysis of the X-ray spur and southeast of the Large Magellanic Cloud (2021) Knies J, Sasaki M, Fukui Y, Tsuge K, Haberl F, Points S, Kavanagh PJ, Filipović MD Journal article The eROSITA X-ray telescope on SRG (2021) Predehl P, Andritschke R, Arefiev V, Babyshkin V, Batanov O, Becker W, Böhringer H, et al. Journal article Extreme ultra-soft X-ray variability in an eROSITA observation of the narrow-line Seyfert 1 galaxy 1H 0707-495 (2021) Boller T, Liu T, Weber P, Arcodia R, Dauser T, Wilms J, Nandra K, et al. Journal article A giant X-ray dust scattering ring discovered with SRG/eROSITA around the black hole transient MAXI J1348-630 (2021) Lamer G, Schwope AD, Predehl P, Traulsen I, Wilms J, Freyberg M Journal article