Hauke, R.L. 1967: A systematic study of Equisetum arvense. Nova Hedwigia 13: 81–109.
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| Hauke, R.L. 1967: A systematic study of Equisetum arvense. Nova Hedwigia 13: 81–109. |
| Hauke, R.L. 1967: A systematic study of Equisetum arvense. Nova Hedwigia 13: 81–109. |