Coalition formation among male baboons / Ronald NoëMolecular basis of cytoplasmic male sterility in sunflower / Mariana Ivanova SpassovaMale copulation behaviour of the hermaphroditic pond snail Lymnaea stagnalis / Petronella Afra Cornelia Maria de BoerCytoplasmic male sterility in petunia hybrida : a structural and histochemical analysis / R.J. Bino