Authors: Penkov, AI Varushev, LP Koshelev, VN Belenko, EV Ostriagin, AI Liubimov, VS

Citation: Ai. Penkov et al., Increasing efficiency of drilling mud lubricating additives action, NEFTY KHOZY, (5), 2000, pp. 33-35

Authors: Penkov, AI Vahrushev, LP Belenko, EV Ostriagin, AI

Citation: Ai. Penkov et al., Improvement of drilling mud lubricating properties evaluation methodics, NEFTY KHOZY, (9), 1999, pp. 26-29