Kirane, Mokhtar, y Mahmoud Qafsaoui. 2002. «On the asymptotic behavior for convection-diffusion equations associated to higher order elliptic operators in divergence form». Revista Matemática Complutense 15, nº 2:: 585-98. https://doi.org/10.5209/rev_REMA.2002.v15.n2.16930