Stalagmite paleomagnetic record of a quiet mid-to-late Holocene field activity in central South America oleh Plinio Jaqueto, Ricardo I. F. Trindade, Filipe Terra-Nova, Joshua M. Feinberg, Valdir F. Novello, Nicolás M. Stríkis, Peter Schroedl, Vitor Azevedo, Beck E. Strauss, Francisco W. Cruz, Hai Cheng, R. Lawrence Edwards