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Ammann, K.; Jacot, Yolande (1999). Pollen-Mediated Gene Transfer: A Holistic View. Phytoparasitica, 27(4), p. 317. Springer Netherlands
Ammann, K.; Ammann, B. (1969). Die fennoskandische Verbreitung von Pilophorus (Tuck.) Th.Fr., Stereocaulaceae. Herzogia, 1, pp. 87-94. Borntraeger/Cramer