References

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4. Jessen, K. and Altmann, B., 'Fundamental aspects of tonometry methods and their standardization,' Concepts Toxicol., Vol. 4, pp. 285-292, 1987
5. http://www.berlin.ptb.de/8/_indexe.html
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7. Jessen, K. and Hoffmann, F., 'The current state and its inspection-instances of the standardization of air impulse tonometer: Non-contact tonometer II,' Klin. Mbl. Augenheik., Vol. 183, pp. 296-300, 1983 https://doi.org/10.1055/s-2008-1054925