Pälike, H., Norris, R.D., Herrle, J.O., Wilson, P.A., Coxall, H.K., Lear, C.H., Shackleton, N.J., Tripati, A.K. and Wade, B.S. (2006) The heartbeat of the Oligocene climate system. Science, 314, (5807), 1894-1898. (doi:10.1126/science.1133822)
Pälike, H., Norris, R.D., Herrle, J.O., Wilson, P.A., Coxall, H.K., Lear, C.H., Shackleton, N.J., Tripati, A.K. and Wade, B.S. (2006) The heartbeat of the Oligocene climate system. Science, 314, (5807), 1894-1898. (doi:10.1126/science.1133822)