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Klinische Wochenschrift|June 1, 1984
[Pulsed Doppler echocardiography in aortic valve disease]H Mattern, G R Fricke, F KrückResuscitation|March 1, 1980
Optimization of the regular frequency of the heart in atrial fibrillation in relation to the cardiac outputG R Fricke, H Mattern, K J FrickeBiomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie|January 1, 1984
Klinefelter's syndrome and mitral valve prolapse. an echocardiographic study in twenty-two patientsG R Fricke, H J Mattern, H U Schweikert, et al.Pageof 1