An efficient method for Maxwell’s equations with a discrete double-curl operator in split quaternionic electromagneticsGang Wang, Tongsong Jiang, V. I. Vasil’ev and Zhenwei GuoEur. Phys. J. Plus, 138 4 (2023) 341DOI: https://doi.org/10.1140/epjp/s13360-023-03954-x