| PAST: Paleontological Statistics software packages for education and data analysis Ø Hammer, DAT Harper, PD and Ryan Palaeontologia Electronica 4 (1), 1-9, 2001 | 31087* | 2001 |
| Paleontological data analysis Ø Hammer, DAT Harper John Wiley & Sons, 2008 | 1490 | 2008 |
| Numerical palaeobiology: computer-based modelling and analysis of fossils and their distributions DAT Harper Wiley-Blackwell, 1999 | 359 | 1999 |
| Ordovician and Silurian sea–water chemistry, sea level, and climate: a synopsis A Munnecke, M Calner, DAT Harper, T Servais Palaeogeography, Palaeoclimatology, Palaeoecology 296 (3-4), 389-413, 2010 | 324 | 2010 |
| A revision of Ordovician series and stages from the historical type area RA Fortey, DAT Harper, JK Ingham, AW Owen, AWA Rushton Geological Magazine 132 (1), 15-30, 1995 | 280 | 1995 |
| Palaeoecology: Ecosystems, environments and evolution PJ Brenchley, DAT Harper CRC Press, 1998 | 268 | 1998 |
| Late Ordovician to earliest Silurian graptolite and brachiopod biozonation from the Yangtze region, South China, with a global correlation C Xu, R Jiayu, CE Mitchell, DAT Harper, F Junxuan, Z Renbin, ... Geological Magazine 137 (6), 623-650, 2000 | 256 | 2000 |
| The great Ordovician biodiversification event (GOBE): the palaeoecological dimension T Servais, AW Owen, DAT Harper, B Kröger, A Munnecke Palaeogeography, Palaeoclimatology, Palaeoecology 294 (3-4), 99-119, 2010 | 247 | 2010 |
| The Ordovician biodiversification: Setting an agenda for marine life DAT Harper Palaeogeography, Palaeoclimatology, Palaeoecology 232 (2-4), 148-166, 2006 | 242 | 2006 |
| A global synthesis of the latest Ordovician Hirnantian brachiopod faunas R Jia-Yu, DAT Harper Earth and Environmental Science Transactions of The Royal Society of …, 1988 | 240 | 1988 |
| The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hirnantian Stage (the uppermost of the Ordovician System) X Chen, J Rong, J Fan, R Zhan, CE Mitchell, DAT Harper, MJ Melchin, ... Episodes 29 (3), 183, 2006 | 228 | 2006 |
| PAST—PAlaeontological STatistics, ver. 1.81 Ø Hammer, DAT Harper, PD Ryan Software documentation, 2008 | 219* | 2008 |
| Introduction to paleobiology and the fossil record MJ Benton, DAT Harper John Wiley & Sons, 2020 | 210 | 2020 |
| A revised correlation of Ordovician rocks in the British Isles RA Fortey, DAT Harper Geological Society of London, 2000 | 206 | 2000 |
| Bivalve mollusks in metal pollution studies: from bioaccumulation to biomonitoring M Zuykov, E Pelletier, DAT Harper Chemosphere 93 (2), 201-208, 2013 | 193 | 2013 |
| PAST: Paleontological Statistics, Version 3.0 Ø Hammer, DAT Harper, PD Ryan Reference manual. Oslo: Natural History Museum University of Oslo, 2013 | 183 | 2013 |
| Asteroid breakup linked to the Great Ordovician biodiversification event B Schmitz, DAT Harper, B Peucker-Ehrenbrink, S Stouge, C Alwmark, ... Nature Geoscience 1 (1), 49-53, 2008 | 173 | 2008 |
| End Ordovician extinctions: a coincidence of causes DAT Harper, EU Hammarlund, CMØ Rasmussen Gondwana Research 25 (4), 1294-1307, 2014 | 172 | 2014 |
| A sulfidic driver for the end-Ordovician mass extinction EU Hammarlund, TW Dahl, DAT Harper, DPG Bond, AT Nielsen, ... Earth and Planetary Science Letters 331, 128-139, 2012 | 151 | 2012 |
| PAST–paleontological statistics, version 2.17 Ø Hammer, DAT Harper, PD Ryan URL: http://folk. uio. no/ohammer/past (Accessed 10 December 2012), 2012 | 147 | 2012 |
