The Internet Archive has a preservation copy of this work in our general collections.
Robert Pschorr. "III. Ueber des 1-Phenyl-2,3 -dimethyl-4-oxy-5- pyrazolon1) (4-Oxyantipyrin)." Justus Liebig s Annalen der Chemie 293.1-2 (1896) 49-52