1. Terra , A. 1954 . Significance of the anamorphosis partition curve and the Ecart probable in washery control. Paper presented at the 2nd International Coal Preparation Congress. Essen.
2. Belugou , P. , and F. Vitaux . 1951 . The control of the washing of fine coal in the coalfields. InProceedings of the 1st International Conference on Coal Preparation Congress, 196–216. Paris.
3. Regional Frequency Analysis