![book Global Differential Geometry and Global Analysis 1984](/covers/files_170/74000/7a67c6f78fcda617c4ed942a97c15b3e-d.jpg)
- Author: Dirk Ferus Robert B. Gardner Sigurdur Helgason Udo Simon
- Language: English
- Year: 1985
![book The method of equivalence and its applications](/covers/files_170/72000/b3983b8e698bebe8a93d45a4990b062d-d.jpg)
- Author: Robert B. Gardner
- Language: English
- Year: 1987
![book Method of equivalence and its applications](/covers/files_170/7000/4ff86daafcaecce35b3b8706c3b34e84-d.jpg)
- Author: Robert B. Gardner
- Language: English
- Year: 1987
![book Exterior Differential Systems](/covers/files_170/3000/02320B90D253B293BF8A7D49C0999F95-d.jpg)
- Author: Robert L. Bryant S. S. Chern Robert B. Gardner Hubert L. Goldschmidt P. A. Griffiths (auth.)
- Language: English
- Year: 1991