1. Der Kreislauf der Kohlensaure in der Natur;Lundeårdh,1924
2. Greenhouse climate control: New challenges;Bailey;Acta Hort.,1995
3. CO2 enrichment of protected crops;Porter;Hortic. Res.,1985
4. Effects of CO2 concentration on strawberry. VI. Fruit yield and quality;Chen;Angew Bot.,1997
5. The blooming United State botanical market: A new overview;Brevoort;Herbalgram,1998