I was asked to write an article for the big Handbuch der Physik by Geiger and Scheel, and to write an article about one and two electron problems. And in this I brought together everything that was known about the quantum treatment not only of hydrogen, but also of two electron problems. I had done the hydrogen negative ion, I had been very interested in the Hartree approach of... to heavier atoms where you use the charge distribution of all other electrons to make the potential for any one electron. In fact I was interested in that from the beginning and Ewald had made me even more interested in it. So I wrote a Handbuch article of some 300 pages on this subject. I brought together the theory of the hydrogen atom, including the continuum wave functions, the optical properties, or some rules... sum rule of oscillator strength, sum rule oscillator strength times energies difference, and so on. And then the collision problem... everything I knew about the collision problems from my work, and in addition polarization of the radiation which is emitted after an electron collision. So I put in absolutely everything that I knew.

[Q] Stark effect, Zeeman effect, fine structure, hyperfine structure.

Indeed. All of these, the Stark effect and Zeeman effect in particular, including Stark effect in very strong fields.