1. Note on Jordan elimination, linear programming and Tchebycheff approximation
2. The Numerical Treatment of Differential Equations;Collatz,1960
3. The Numerical Treatment of Differential Equations;Collatz,1960
4. Spannungszustand in rechteckigen ebenen Platten;Hencky,1913
5. Approximate Methods of Higher Analysis;Kantorovich,1958