Foucault, G., Kellershohn, N., Seydoux, F., Yon, J., Parquet, C., & Arrio, B. Comparative study of some conformational properties of alpha, beta and psi bovine trypsins. Biochimie, 56(10), 1343-50. https://doi.org/10.1016/s0300-9084(75)80020-4 (Original work published 1974)