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)