Jülicher, Frank. "Active fluids and gels." New Trends in the Physics and Mechanics of Biological Systems: Lecture Notes of the Les Houches Summer School: Volume 92, July 2009. : Oxford University Press, 2011-05-26. Oxford Scholarship Online. 2011-09-22. Date Accessed 23 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199605835.001.0001/acprof-9780199605835-chapter-4>.
Jülicher, F.(2011-05-26). Active fluids and gels. In New Trends in the Physics and Mechanics of Biological Systems: Lecture Notes of the Les Houches Summer School: Volume 92, July 2009. : Oxford University Press. Retrieved 23 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199605835.001.0001/acprof-9780199605835-chapter-4.
Jülicher, Frank. "Active fluids and gels." In New Trends in the Physics and Mechanics of Biological Systems: Lecture Notes of the Les Houches Summer School: Volume 92, July 2009. : Oxford University Press, 2011-05-26. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199605835.001.0001/acprof-9780199605835-chapter-4.
Jülicher F. Active fluids and gels. In: Ben Amar M, Goriely A, Müller MM, Cugliandolo L. New Trends in the Physics and Mechanics of Biological Systems: Lecture Notes of the Les Houches Summer School: Volume 92, July 2009. Oxford University Press; 2011. http://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780199605835.001.0001/acprof-9780199605835-chapter-4. Accessed May 23, 2013.