1. De Kock, P. C.: The iron nutrition of plants at high pH. - Soil Sci.79: 167–175, 1955.
2. Freyer, H. C.: Elements of Statistics. - J. Wiley, New York 1975.
3. Holmes, R. R.: Effect of phosphorus and pH on iron chlorosis of the blueberry in water culture. - Soil Sci.90: 374–379, 1960.
4. Ivanova, E. V.: [The effect of different phosphorus and iron relationships in nutrient medium on uptake and distribution of these elements in bean plants.] In Russ. - Vest. Mosk. Univ., Ser. Biol. Pochvoved.25: 87–91, 1970a.
5. Ivanova, E. V.: [Effect of phosphate nutrition on oxidative processes at different iron supplies in beans.] In Russ. - Vest. Mosk. Univ., Ser. Biol. Pochvoved.25: 106–110, 1970b.