1. Dynamics of a System of Rigid Bodies;Routh,1877
2. The Conditions Under Which an Equation Has Only Roots With Negative Real Parts;Hurwitz;Math. Ann.,1895
3. Regeneration Theory;Nyquist;Bell System Tech. Jour.,1932
4. A New Stability Criterion of Linear Servomechanism by a Graphical Method;Numakura;AIEE Trans., Appl. and Ind.,1957
5. Relative Damping as a Criterion for Stability and as an Aid in Finding the Roots of a Hurwitz Polynomial;Leonhard,1952