Some interesting articles:

Nei Jia: the Qigong and Taijiquan Forum Qigong and Meditation
1

http://www.singingdragon.com/blog/2012/12/bertschinger_article_dec2012/

2

I have a book on the spirtitual aspects of Qigong:

http://www.amazon.com/Healing-Purifying-Manifesting-through-Ancient/dp/1482080990/