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Pricking, S., Spilker, K., Martinsson, G., Rau, J., Tönißen, A., Bollwein, H., & Sieme, H. (2019). Equine fetal gender determination in mid- and advancedgestation by transabdominal approach – comparative study using 2D B-Mode ultrasound, Doppler sonography, 3D B-Mode and following tomographic ultrasound imaging. Pferdeheilkunde, 35(1), 11–19. https://doi.org/10.21836/pem20190102
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Tönißen, A., Müller-Stephan, L., & Sieme, H. (2019). Hysteroscopic catheterisation of the equine oviduct. In Reproduction in domestic animals: physiology, pathology, biotechnology. Blackwell, Wiley-Blackwell. https://doi.org/10.1111/(ISSN)1439-0531
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Tönissen, A. (2016). Transabdominal ultrasonography during advanced gestation in horses to perform fetal gender determination with special consideration of practicability and repeatability of the examination technique [Bibliothek der Tierärztlichen Hochschule Hannover]. https://nbn-resolving.org/urn:nbn:de:gbv:95-108623
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