The EXOD search for faint transients in XMM-Newton observations: Method and discovery of four extragalactic Type I X-ray burstersI. Pastor-Marazuela, N. A. Webb, D. T. Wojtowicz and J. van LeeuwenA&A, 640 (2020) A124DOI: https://doi.org/10.1051/0004-6361/201936869