For our english readers we contribute a thorough book on this perpetually contemporary topic, luckily this is not a "handbook". The Virial Theorem in Stellar Astrophysics by George W. Collins A long term work. Since "the new cosmos" (~1920s) plasmaphysics and stellar (astro-) physics are related. Pulsars were discovered in 1967 and are treated in the book, as well as in the Calculations of the Stellar Structure of so-called Degenerate Stars, with the right frequencies! Available via the AG or linked below. (The MPG eDoc server has not digitalized this work yet.)