http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
pt. 1. The mechanism of apomixis.--pt. 2. The casual aspect of apomixis.--pt. 3. Biotype and species formation.
Kungl. fysiografiska sallskapets handlingar ; n.f., bd. 57, nr. 3; bd. 58, nr. 2; bd. 58, nr. 12
Acta Universitatis Lundensis, n. s. Bd. 43, Nr. 12