Also available from PSS is the textbook, Portfolio Management, by the same author as the software package. The book gives an in depth treatment of the theoretical model used in the software package. It presents the theoretical transformation of financial theory using signal processing to describe risk. The stochastic generalized portfolio network model derived in the book creates a unified field of financial risk management and portfolio optimization. A complete derivation of Digital Portfolio Theory is available in the book Portfolio Management published by McGraw-Hill in 1992.