Parnell, C; Langhoff-Roos, J; Møller, H; (2001) Conduct of labor and rupture of the sphincter ani. Acta obstetricia et gynecologica Scandinavica, 80 (3). pp. 256-261. ISSN 0001-6349 DOI: https://doi.org/10.1034/j.1600-0412.2001.080003256.x Full text not available from this repository.