Letherman, K M, and K Nayar. “A Simple Constant-Length Expansion Rig”. Journal of Physics E: Scientific Instruments, vol. 13, no. 1, 1980, pp. 25-26, https://doi.org/10.1088/0022-3735/13/1/006.
Letherman, K. M., & Nayar, K. (1980). A simple constant-length expansion rig. Journal of Physics E: Scientific Instruments, 13(1), 25-26. https://doi.org/10.1088/0022-3735/13/1/006
Letherman KM, Nayar K. A simple constant-length expansion rig. Journal of Physics E: Scientific Instruments. 1980;13(1):25-6.