1. IEEE C37.112-1996 - IEEE Standard Inverse-Time Characteristic Equations for Overcurrent Relays.
2. IEC Standard, "Communication networks and systems in substations - Part 8-1: Specifc Communication Service Mapping (SCSM) - Mappings to MMS (ISO 9506-1 and ISO 9506-2) and to ISO/lEC 8802-3."
3. J. Lewis Blackburn, Thomas J. Domin. Protective Relaying- Principles and Applications, Fourth Edition-CRC Press, 2014, ISBN: 978-1-4398-8812-4.
4. Mladen Kezunovic, Jinfeng Ren, Saeed Lotfifard. Design, Modeling and Evaluation of Protective Relays for Power Systems. Springer, 2016, ISBN 978-3-319-20918-0.
5. J. C. Das . Power System Protective Relaying. Taylor & Francis Group, 2018. ISBN: 978-1-4987-4550-5