Cerný V, Turek Z, Parízková R (2007). "Orthogonal polarization spectral imaging" (PDF). Physiol Res. 56 (2): 141–7. doi:10.33549/physiolres.930922. PMID 16555953. http://www.biomed.cas.cz/physiolres/pdf/56/56_141.pdf
"OPS Imaging". Cytometrics. Retrieved 2009-08-17. http://www.cytometrics.com/ops.htm
Harris, AG; Sinitsina I; Messmer K. (April 2002). "Validation of OPS imaging for microvascular measurements during isovolumic hemodilution and low hematocrits". Am J Physiol Heart Circ Physiol. 282 (4): 1502–9. doi:10.1152/ajpheart.00475.2001. PMID 11893588. /wiki/Doi_(identifier)