1. First report on friction experiments (friction of lubricated bearings,1883
2. First report on friction experiments (friction of lubricated bearings;Tower,1884
3. Friction in Machines and the Effect of the Lubricant;Petrov;Inzh. Zh. St-Peterb.,1883
4. Friction in Machines and the Effect of the Lubricant;Petrov;Inzh. Zh. St-Peterb.,1883
5. Friction in Machines and the Effect of the Lubricant;Petrov;Inzh. Zh. St-Peterb.,1883