1. Stability and error bounds in the numerical integration of ordinary differential equations;Dahlquist, Germund;Kungl. Tekn. H\"{o}gsk. Handl. Stockholm,1959
2. Theory of errors in numerical integration of ordinary differential equations;Urabe, Minoru;J. Sci. Hiroshima Univ. Ser. A-I Math.,1961
3. Approximate computation of errors in numerical integration of ordinary differential equations by one-step methods;Shintani, Hisayoshi;J. Sci. Hiroshima Univ. Ser. A-I Math.,1965
4. Periodic solutions of van der Pol’s equation with damping coefficient 𝜆=2∼10;Urabe, Minoru;J. Sci. Hiroshima Univ. Ser. A,1960