@article{MABA_1996_10_1_a11,
     author = {R. E. Ewing and S. D. Margenov and P. S. Vassilevski},
     title = {Preconditioning the {Biharmonic} {Equation} by {Multilevel} {Iterations}},
     journal = {Mathematica balkanica},
     pages = {121},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1996},
     url = {http://geodesic.mathdoc.fr/item/MABA_1996_10_1_a11/}
}