1. Adamec, L. (2002). Leaf absorption of mineral nutrients in carnivorous plants stimulates root nutrient uptake. New Phytol, 155, 89–100.
2. Andersen, M. N., Jensen, C. R., & Losch, R. (1992). The interaction effects of potassium and drought in field-grown barley: I. yield, water-use efficiency and growth. Acta Agriculturae Scandinavica, Section B - Plant Soil Science, 42, 34–44.
3. Bano, A., Rehman, A., & Winiger, M. (2009). Altitudinal variation in the content of protein, proline, sugar and abscisic acid (aba) in the alpine herbs from hunza valley, Pakistan. Pak J Bot, 41, 1593–1602.
4. Barker, D. J., Sullivan, C. Y., & Moser, L. E. (1993). Water deficit effects on osmotic potential, cell wall elasticity, and proline in five forage grasses. Agron J, 85, 270–275.
5. Bates, L. S., Waldren, R. P., & Teare, I. D. (1973). Rapid determination of free proline for water stress studies. Plant Soil, 39, 205–207.