Nielsen, M. (1998). Reasoning about the past. In L. Brim, J. Gruska & J. Zlatuska (Eds.), Mathematical Foundations of Computer Science 1998: 23rd International Symposium, MFCS'98 Brno, Czech Republic, August 24-28, 1998 Proceedings (pp. 117-128). Springer. https://doi.org/10.1007/BFb0055761
Arge, L. A., Procopiuc, O., Ramaswamy, S., Suel, T. & Vitter, J. S. (1998). Scalable Sweeping-Based Spatial Join. In Proceedings of 24th Annual International Conference on Very Large Databases
Kragh, H. (1998). Scintillation counter. In R. Bud, S. Johnston & D. Warner (Eds.), Instruments of Science: A Historical Encyclopedia (pp. 525-526). Garland Science.