1. Alternatives in Gearbox Seals for Main Drive Gearboxes;Roche,2006
2. ISO 6194-1:2007, Rotary shaft lip-type seals incorporating elastomeric sealing elements—Part 1: Nominal dimensions and tolerances. Geneva, Switzerland, 2007https://www.iso.org/obp/ui/#iso:std:iso:6194:-1:ed-2:v1:en:sec:6.1
3. DIN 3760 1996-09; Radial shaft sealing rings. Germany, 1996https://www.beuth.de/en/standard/din-3760/2815256
4. Radial Oil Seal,2009