i'm writing my BA Thesis about "Equally-weighted Risk contributions". Can anyone recommend math books for further understanding of Risk contributions?
This sounds like risk parity to me. For example, instead of a traditional portfolio of 60% equity + 40% fixed income, you'd allocated 50% of ex-ante risk to equity and 50% of ex-ante risk to fixed income. This strategy is extremely well studied. Just google "risk parity" and you'll find a lot of literature.