Alexander, H., Beetstra, T., Bell, D., Cannan, S., Dee, E., Doyle, P., Fitzgerald, G., French, C., Jefferys, J., Kerridge, J., Pilgrim, W., Rabone, D., Ras, F., Reilly, M., Robinson, H., Stacey, G., & Weatherhead, A. (1984). An architecture and syntax for distributed databases. Computers and Standards, 3(1), 33-56. https://doi.org/10.1016/0167-8051%2884%2990025-1