Ward, L. S., R. B. Novis, V. T. Nascimento, M. S. Nóbrega, and M. J. A. Saad. “Determination of Glucose Levels Using Dried Filter Paper Blood Spots: New Perspective in Home Monitoring”. São Paulo Medical Journal, vol. 114, no. 1, Jan. 1996, pp. 1100-13, https://periodicosapm.emnuvens.com.br/spmj/article/view/1858.