V. Huaringa P, R. Grandez R., and E. Hinostroza M., “Comparison between the standardized absorbent paper points test and the Schirmer’s tear test to evaluate tear production in clinically healthy dogs”, Rev. investig. vet. Perú, vol. 26, no. 3, pp. 412–419, Sep. 2015, doi: 10.15381/rivep.v26i3.11173.