الكتاب رقم 1
Introduction to Global Variational Geometry
Demeter Krupka
الكتاب رقم 2
The Inverse Problem of the Calculus of Variations
Dmitry V. Zenkov
الكتاب رقم 3
Noether's Theorems
Gennadi Sardanashvily
الكتاب رقم 4
Cartan Geometries and their Symmetries
Mike Crampin & David Saunders