WÄCHTER, OTTO. "Paper Strengthening. Mass Conservation of Unbound and Bound Newspapers" Restaurator, 8.2-3 (2009): 111-123. Retrieved 26 May. 2013, from doi:10.1515/rest.1987.8.2-3.111

WÄCHTER, O. (2009). Paper Strengthening. Mass Conservation of Unbound and Bound Newspapers. Restaurator, 8(2-3), pp. 63-149. Retrieved 26 May. 2013, from doi:10.1515/rest.1987.8.2-3.111

WÄCHTER, OTTO. 2009. Paper Strengthening. Mass Conservation of Unbound and Bound Newspapers. Restaurator. 8(2-3): 63-149. Retrieved 26 May. 2013, from doi:10.1515/rest.1987.8.2-3.111