1. Bradley D (1965) The hydrocyclone. Oxford: Pergamon Press
2. Kelsall DF (1952) Trans Inst Chem Engrs 30: 87
3. Bradley D, DJ Pulling (1959) Trans Inst Chem Engrs 37: 34
4. Fontein FJ, C Dijksman (1953) Recent developments in mineral dressing. London: Inst. Min. Metall
5. Kelsall DF (1953) Recent developments in mineral dressing. London: Inst. Min. Metall