1 - Gauge theory and variational principles
Bleecker, David (1948-....)

Cote : [90 BLE 81]

2 - Lectures on the Ekeland variational principle with applications and detours
De Figueiredo, Djairo Guedes

Cote : [42 DE-FIG 89]

3 - The variational principles of mechanics - 4th edition
Lanczos, Cornelius (1893-1974)

Cote : [84 LAN 70]

4 - Variational principles
Moiseiwitsch, Benjamin Lawrence

Cote : [82 MOI 66]