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APA Citation
Jenni, R., Ritter, M., Vieli, A., Hirzel, H. O., Schmid, E. R., Grimm, J., & Turina, M. (1989). determination of the ratio of pulmonary blood flow to systemic blood flow by derivation of amplitude weighted mean velocity from continuous wave Doppler spectra.. Heart, 61(2), 167–171. http://access.bl.uk/ark:/81055/vdc_100143576538.0x000032