J. L. Laus, P. D. Galera, M. S. B. de Souza, A. Morales, and A. L. de Andrade, “Standardization of the values of the "Schirmer Tear Test" modificated and of the ‘Schiötz Tonometry Indentation’ from dogs of the region of Jaboticabal - SP – Brazil”, Braz. J. Vet. Res. Anim. Sci., vol. 32, no. 3, pp. 173–176, Sep. 1995, doi: 10.11606/issn.1678-4456.bjvras.1994.52106.