| Reinforcement: origin, dynamics, and fate of an evolutionary hypothesis DJ Howard Hybrid zones and the evolutionary process, 46-69, 1993 | 652 | 1993 |
| Endless forms: species and speciation DJ Howard, SH Berlocher Oxford University Press, USA, 1998 | 579 | 1998 |
| Clustering of contact zones, hybrid zones, and phylogeographic breaks in North America NG Swenson, DJ Howard The American Naturalist 166 (5), 581-591, 2005 | 502 | 2005 |
| The nonprofit starvation cycle AG Gregory, D Howard Stanford Social Innovation Review 7 (4), 49-53, 2009 | 373 | 2009 |
| Conspecific sperm and pollen precedence and speciation DJ Howard Annual Review of Ecology and Systematics 30 (1), 109-132, 1999 | 337 | 1999 |
| Genetic analysis of hybrid zones: numbers of markers and power of resolution WJ Boecklen, DJ Howard Ecology 78 (8), 2611-2616, 1997 | 325 | 1997 |
| A zone of overlap and hybridization between two ground cricket species DJ Howard Evolution 40 (1), 34-43, 1986 | 200 | 1986 |
| Hybrid zones and the evolutionary process DJ Howard, RG Harrison Oxford Univ. Press,, 1993 | 170 | 1993 |
| A postinsemination barrier to fertilization isolates two closely related ground crickets PG Gregory, DJ Howard Evolution 48 (3), 705-710, 1994 | 162 | 1994 |
| Endless forms: species and speciation K de Queiroz, DJ Howard, SH Berlocher Oxford University press 57, 75, 1998 | 161 | 1998 |
| HOW DISCRETE ARE OAK SPECIES? INSIGHTS FROM A HYBRID ZONE BETWEEN QUERCUS GRISEA AND QUERCUS GAMBELII DJ Howard, RW Preszler, J Williams, S Fenchel, WJ Boecklen Evolution 51 (3), 747-755, 1997 | 161 | 1997 |
| Reinforcement: the road not taken JL Marshall, ML Arnold, DJ Howard Trends in Ecology & Evolution 17 (12), 558-563, 2002 | 158 | 2002 |
| Conspecific sperm precedence is an effective barrier to hybridization between closely related species DJ Howard, PG Gregory, J Chu, ML Cain Evolution 52 (2), 511-516, 1998 | 150 | 1998 |
| GENETIC DIFFERENTIATION AMONG HOST‐ASSOCIATED POPULATIONS OF THE GALLMAKER EUROSTA SOLIDAGINIS (DIPTERA: TEPHRITIDAE) GL Waring, WG Abrahamson, DJ Howard Evolution 44 (6), 1648-1655, 1990 | 134 | 1990 |
| Do suture zones exist? NG Swenson, DJ Howard Evolution 58 (11), 2391-2397, 2004 | 122 | 2004 |
| Reproductive processes in two oak (Quercus) contact zones with different levels of hybridization JH Williams, WJ Boecklen, DJ Howard Heredity 87 (6), 680-690, 2001 | 116 | 2001 |
| Endless forms: species and speciation WR Rice, DJ Howard, SH Berlocher Oxford University Press,, 1998 | 113 | 1998 |
| Sperm and speciation DJ Howard, SR Palumbi, LM Birge, MK Manier Sperm biology, 367-403, 2009 | 111 | 2009 |
| Post-insemination signalling systems and reinforcement DJ Howard, PG Gregory Philosophical Transactions of the Royal Society of London. Series B …, 1993 | 98 | 1993 |
| Reinforcing selection is effective under a relatively broad set of conditions in a mosaic hybrid zone ML Cain, V Andreasen, DJ Howard Evolution 53 (5), 1343-1353, 1999 | 96 | 1999 |
