Spassov, S.; Heller, F.; Evans, M. E.; Yue, L. P.; Ding, Z. L. (2001): The Matuyama/Brunhes geomagnetic polarity transition at Lingtai and Baoji, Chinese Loess Plateau. Pergamon, Oxford, International, In: Hoffmann, V. H. (editor), Environmental magnetism; signature of past changes and present environment, 26 (11-12), 899-904, georefid:2006-001768