Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Kojima, K and Yamashita, T(2021). Measurement of vdark, vlight, and kd and estimation of kth. Bio-protocol Preprint. bio-protocol.org/prep1485.
Kojima, K., Matsutani, Y., Yanagawa, M., Imamoto, Y., Yamano, Y., Wada, A., Shichida, Y. and Yamashita, T.(2021). Evolutionary adaptation of visual pigments in geckos for their photic environment. Science Advances 7(40). DOI: 10.1126/sciadv.abj1316