Georgescu, A., Oprea, I., & Oprea, C. (1989). Bifurcation manifolds in a multiparametric eigenvalue problem for linear hydromagnetic stability theory.
Anal. Numér. Théor. Approx.,
18(2), 123-138.
https://ictp.acad.ro/jnaat/journal/article/view/1989-vol18-no2-art4