. "Elementary divisors and some properties of the Lyapunov mapping X - AX + XA*"@en . . . "A study is presented in which the primary emphasis is placed on establishing easy and convenient techniques for a further study of the Lyapunov mapping and in which completeness is uniformly preferred to brevity."@en . . . . . "Elementary divisors and some properties of the Lyapunov mapping X -> AX + XA*"@en . . "Elementary divisors and some properties of the Lyapunov mapping X to AX + XA*"@en . . . . . . . . . . . . . .