1. Darwin, C., 1862: On the two forms, or dimorphic condition, in the species ofPrimula, and on their remarkable sexual relations. Proc. Linn. Soc. (Bot.)6, 105?139.
2. ?, 1877: The different forms of flowers on plants of the same species. London: John Murray.
3. Dulberger, R., 1974: Structural dimorphism of stigmatic papillae in distylousLinum species. Amer. J. Bot.61, 238?243.
4. Ferrari, T. E., Wallace, D. H., 1975: Germination ofBrassica pollen and expression of incompatibilityin vitro. Euphytica24, 757?765.
5. Golinskaya, E. L., Bashnikova, N. V., Tomchuk, N. N., 1976: Phytohaemagglutinins of the pistil inPrimula as possible proteins of generative incompatibility. Sov. Plant Phys.23, 169?176 (translated from Fiziol. Rasteni23, 88?97).