Laskowski, R. A., et al. “PROCHECK: A Program to Check the Stereochemical Quality of Protein Structures”. Journal of Applied Crystallography, vol. 26, no. 2, 1993, pp. 283-91, https://doi.org/10.1107/s0021889892009944.
Laskowski, R. A., MacArthur, M. W., Moss, D. S., & Thornton, J. M. (1993). PROCHECK: a program to check the stereochemical quality of protein structures. Journal of Applied Crystallography, 26(2), 283-291. https://doi.org/10.1107/s0021889892009944
Laskowski RA, MacArthur MW, Moss DS, Thornton JM. PROCHECK: a program to check the stereochemical quality of protein structures. Journal of Applied Crystallography. 1993;26(2):283-91.