Doctrine is the sixth studio album by Dutch technical death metal band Pestilence, which was released on April 24, 2011.[1] The album was recorded and mixed at Woodshed Studio in southern Germany with engineer Victor "V.Santura" Bullok. The artwork was designed by Marko Saarelainen. The album represents a second release by the reformed Pestilence, with two new members: Yuma van Eekelen and Jeroen Paul Thesseling, who was a member of the band during the Spheres era. Technically, the album is an experimentation with very low tunings, with Mameli and Uterwijk playing on 8-string guitars with standard tuning, and Thesseling playing a 7-string fretless bass tuned in f# sharp.
^[1]. Heavy Blog is Heavy. 2011-07-09. Retrieved on 2012-07-01.
^Petra Schurer. [2]. metal-hammer.de 2011-07-15. Retrieved on 2012-07-01.
^Erik Thomas "Archived copy". Archived from the original on 2011-11-14. Retrieved 2012-07-01.CS1 maint: archived copy as title (link). metalreview.com 2011-08-18. Retrieved on 2012-07-01.