1. V. V. Ragulin, ?Contribution to the problem of flow of a viscous liquid through a bound region with a given pressure drop or head,? in: Dynamics of Continuous Media: Collection of Scientific Works [in Rassian], No. 27, Institute of Hydrodynamics, Siberian Branch, Academy of Sciences of the USSR (1976).
2. G. Cognet, M. Lebouche, and M. Souhar, ?Utilisation des techniques electrodynamiques pour la mesure de frottement parietal dans les ecoulements diphasiques,? Houille blanche, No. 5 (1978).
3. O. N. Kashinskii, B. K. Koz'menko, S. S. Kutateladze, and V. E. Nakoryakov, ?Investigation of the friction stress on a wall in an upward slug flow,? Zh. Prikl. Mekh. Tekh. Fiz. No. 5 (1982).
4. V. E. Nakorjakov, O. N. Kashinsky, and B. K. Kozmenko, ?Experimental study of gas liquid slug flow in a small-diameter vertical pipe,? Int. J. Multiphase Flow,12, No. 3 (1986).
5. P. K. Volkov and B. G. Kuznetsov, ?Numerical solution of the problem of stationary flow of a viscous liquid past a gas cavity in a pipe,? ChMMSS,13, No. 5 (1982).