If you’d like, I can:
Thomas Kailath’s "Linear Systems" (commonly a textbook/lecture notes) is a foundational graduate-level resource on linear systems theory covering state-space methods, stability, controllability, observability, linear estimation, and related matrix theory. It is widely used in control, signal processing, and systems engineering courses. thomas kailath linear systems pdf
While the book is out of print by its original publisher (Prentice-Hall), it remains a staple in university libraries. Official Access If you’d like, I can: Thomas Kailath’s "Linear