1. Buswell, S., Caprotti, O., Carlisle, D.P., Dewar, M.C., Gäetano, M., Kohlhase, M.: The OpenMath Standard 2.0 (2004),
http://www.openmath.org
2. Davenport, J.H., Naylor, W.A.: Units and Dimensions in OpenMath (2003),
http://www.openmath.org/documents/Units.pdf
3. Lecture Notes in Computer Science;J. Stratford,2008
4. Organisation Intergouvernementale de la Convention du Mètre. The International System of Units (SI), 8th edn.,
http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf
5. IEEE/ASTM. SI 10-1997 Standard for the Use of the International System of Units (SI): The Modern Metric System. IEEE Inc. (1997)