1. Stick-slip smooth slip as a function of ambient gases and pressures, disproving previous models of adhesive wear;Gao,1989
2. On stick-slip and the velocity dependence of friction at low speeds;Gao;J. Tribol.,1990
3. Adsorption films, humidity, stick-slip and resistance of sliding contacts;Gao,1990
4. Observations on the effect of surface morphology on friction and sliding modes;Gao,1990
5. Experiments on, and a two-component model for, the behavior of water nano-films on metals;Gao,1990