1. Brouers M, Hall DO (1987) In: Webb C, Mavituna F (eds) Plant and animal cells, process possibilities, Ellis Harwood Ltd, Chichester, England pp 193?202
2. Debergh PC (1983) Physiol Plant 59: 270?276
3. Dyer AF (1979) In: Dyer AF (ed) The Experimental Biology of Ferns, Academic Press, London, pp 253?305
4. Dyer AF, King MAL (1979) In: Dyer AF (ed) The Experimental Biology of Ferns, Academic Press, London, pp 307?354
5. Gemmrich AR (1986) J Plant Physiol 125: 157?166