Johnson, D., Gibson, C. T., Anderson, C., Abell, C., & Rayment, T. (2004). Method to determine the spring constant of atomic force microscope cantilevers. Review of Scientific Instruments, 75(2), p. 565. doi:10.1063/1.1642750

Johnson, Daniel, Christopher T. Gibson, Christopher Anderson, Chris Abell, and Trevor Rayment. "Method to Determine the Spring Constant of Atomic Force Microscope Cantilevers." Review of Scientific Instruments 75, no. 2 (2004): 565.

Johnson, Daniel, et al. "Method to Determine the Spring Constant of Atomic Force Microscope Cantilevers." Review of Scientific Instruments 75.2 (2004): 565.