Precup, Radu. “Quasiconvex Functions of Higher Order and the Behaviour of Some Nonlinear Functionals”. Rev. Anal. Numér. Théor. Approx. 21, no. 2 (August 1, 1992): 191–193. Accessed November 22, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1992-vol21-no2-art11.