Instabilities at the surface of magnetic white dwarfs

Based on the articles:
"Quasi-periodic oscillations in accreting magnetic white dwarfs*
I. Observational constraints in X-ray and optical",
by
Published in Astronomy & Astrophysics, 2015, 579, A24
"Quasi-periodic oscillations in accreting magnetic white dwarfs
II. The asset of numerical modelling for interpreting observations",
by
Published in Astronomy & Astrophysics, 2015, 579, A25