Kälber

Phase separation and phase transitions in KC60: A 13C NMR study.

Kälber, Zimmer, Mehring, 1995, Physical review. B, Condensed matter.

Isotope shifts and hyperfine structure in polonium isotopes by atomic-beam laser spectroscopy.

Kälber, Meisel, Kowalewska, 1991, Physical review. A, Atomic, molecular, and optical physics.