For citations:
Katriel J., Montgomery H.E., Sarsa J.A., Buend´ıa E., Galvez F., Sen K.D. Hund’s rule in open-shell states of two-electron systems: From free through confined and screened atoms, to quantum dots. Nanosystems: Physics, Chemistry, Mathematics. 2019;10(1):31-41. https://doi.org/10.17586/2220-8054-2019-10-1-31-41