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References
- ↑ Delhomme 1979, pp. 269–280.
- ↑ Cambardella et al. 1994, pp. 1501–1511.
- ↑ Novak, Moorman & Cambardella 1997, pp. 1271–1277.
- ↑ Jacques et al. 1999, pp. 31–52.
- ↑ Walker, Wood & Oliver 2001, pp. 233–238.
- ↑ Webster 2007.
- ↑ Jansen 1998, pp. 247–253.
- ↑ Dubus, Brown & Beulke 2003, pp. 53–72.