Which algorithms are used in eigevalue solver

[Lory88]

Hi all. It's my first message here, even if I'm reading this forum since some months. I'm quite a newbie in Fortran and Lapack Library and I'm interested in understanding which algorithms are used in some eigensolvers. In particular I'd like to know which methods are used in the following subroutines:

- DSYGV
- DSBGV
- DSTEV

Since I think that iterative methods are used I'd like to know if there is the possibility to set the maximum number of iteration or how many iteration are done by the code.

Thank you all for your answers.

Bye,

Lorenzo