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Cumpson, P J; Hedley, J*; Clifford, C A; Chen, X*; Allen, S* (2004) Microelectromechanical systems device for calibration of atomic force microscope cantilever spring constants between 0.01 and 4 N/m. J. Vac. Sci. Technol. A, 22 (4). pp. 1444-1449.