Multi-band observations of Swift J0840.7−3516: A new transient ultra-compact X-ray binary candidateF. Coti Zelati, A. de Ugarte Postigo, T. D. Russell, A. Borghese, N. Rea, P. Esposito, G. L. Israel and S. CampanaA&A, 650 (2021) A69DOI: https://doi.org/10.1051/0004-6361/202140573
