| Gordon, Theodore J. |
| Il futuro / T.J. Gordon e Olaf Helmer |
Philosophy of mathematics and natural science
| Weyl, Hermann, 1885-1955 |
| Philosophy of mathematics and natural science / Hermann Weyl ; translated by Olaf Helmer ; with a new introduction by Frank Wilczek |
| Princeton : Princeton university press, c2009. |
| Weyl, Hermann, 1885-1955 |
| Philosophy of mathematics and natural science / Hermann Weyl |
| Princeton : Princeton university press, 1949. |