upward

Alkali metals

D Danovich, S Shaik, On the Nature of Bonding in Parallel Spins in Monovalent Metal Clusters, ARPC 67, 18 (2016)

M Verdicchio, S Evangelisti, T Leininger, A Monari, On the triplet ground state of tetrahedral X4 clusters (X = Li, Na, K, Cu), JCP 136, 094301 (2012)

N W Ashcroft, Quantum-solid behavior and the electronic structure of the light alkali metals, PRB 39, 10552 (1989)

R Berliner, O Fajen, H G Smith, R L Hitterman, Neutron powder-diffraction studies of lithium, sodium, and potassium metal, PRB 40, 12086 (1989)