Purification Breaths - other methods

In different yogic practices, the purification breaths are done in variety of ways, here is one of them http://www.glidewing.com/pdf/dreamyoga_ninebreathings.pdf  on youtube videos they can be found as e.g. 'nine purification breaths'. I can recommend also the Bon tradition breaths presented by Tenzin Wangyal Rinpoche, yet in the Heart Tantra specific methods are described.