Good reference on multi-variable calculus of variation

[JulieK]

I am looking for a good and easy access reference on multi-variable calculus of variation with many examples and demonstrations. Although I have many books and references on the calculus of variation, most are focused on single-variable. Any advice will be appreciated.

 

[verty]

Here is cheap book that should be very interesting.

https://www.amazon.com/dp/0486445526/?tag=pfamazon01-20

I wonder if these will be relevant for you:

https://www.amazon.com/dp/0521497701/?tag=pfamazon01-20
https://www.amazon.com/dp/0521451256/?tag=pfamazon01-20

I claim nothing except that these seem related to your request. Best of luck.