H. Pfennig

Wave functions and oscillator strengths of Be-like ions (Be I, C III, N IV, O V)

E. Trefftz, H. Pfennig, R. Steele, 1965 .

On the stark broadening of Ly - α by strong electron collisions

H. Pfennig, 1971 .

Comparison of quasistatic line profiles with measurements on Balmer and Paschen hydrogen lines and lines of the diffuse series of neutral helium

H. Pfennig, 1966 .

A critical note on the up to now available Stark broadening theories of hydrogen

C. Vidal, E. Trefftz, H. Pfennig, 1966 .

On the time-evolution operator in the semiclassical theory of stark-broadening of hydrogen lines

H. Pfennig, 1972 .

On the quadrupole contributions to electron broadening of spectral lines

H. Pfennig, I. S. M. Umbela, 1984 .