Geodesic
Stability of the lateral surface of viscous fingers formed when a fluid is displaced from a Hele-Shaw cell
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2011), pp. 40-46

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It is shown that instability develops on the lateral surface of the viscous fingers formed when a fluid is displaced from a Hele–Shaw cell. This instability is caused by the inertia forces. On the contrary, the viscous forces acting in the plane of the cell stabilize the surface. 
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     author = {O. A. Logvinov},
     title = {Stability of the lateral surface of viscous fingers formed when a fluid is displaced from a {Hele-Shaw} cell},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {40--46},
     publisher = {mathdoc},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2011_2_a6/}
}
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O. A. Logvinov. Stability of the lateral surface of viscous fingers formed when a fluid is displaced from a Hele-Shaw cell. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2011), pp. 40-46. http://geodesic.mathdoc.fr/item/VMUMM_2011_2_a6/