Morphological and thermosolutal instabilities inside a deformable solute boundary layer during directional solidification. I.— Theoretical methods M. Hennenberg, A. Rouzaud, J.J. Favier et D. CamelJ. Phys. France, 48 2 (1987) 173-183DOI: https://doi.org/10.1051/jphys:01987004802017300