1. Clinical tonography;Grant;Tr. Am. Acad. Ophth.,1951
2. Manufactured by V. Mueller & Co., Chicago 12, Illinois.
3. The electronic tonometer;Askovitz;Am. J. Ophth.,1953
4. Tonography: Technical difficulties and control studies;Spencer;Arch. Ophth.,1955
5. Voltage stabilizer and ground-testing unit for use with electronic instruments;Askovitz;Arch. Ophth.,1954