@article{SM_1996_187_11_a2,
     author = {V. A. Klyachin and V. M. Miklyukov},
     title = {Criteria of instability of surfaces of zero mean curvature in warped {Lorentz} products},
     journal = {Sbornik. Mathematics},
     pages = {1643--1663},
     publisher = {mathdoc},
     volume = {187},
     number = {11},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1996_187_11_a2/}
}