upward

Na

V F Degtyareva, O Degtyareva, Structure stability in the simple element sodium under pressure, New J Phys 11, 063037 (2009)

J Raty, E Schwegler, S A Bonev, Electronic and structural transitions in dense liquid sodium, Nature 449, 448 (2007)

I A Solovyov, A V Solovyov, W Greiner, Structure and properties of small sodium clusters, PRA 65, 053203 (2002)