1. Brandt A. B., Tageeva S. V. Optical Parameters of Plant Organisms, 301 p. (Nauka, Moscow, 1967) [in Russian].

2. Voinov O. A., Bekh L. T. Aerovisual assessment of the condition and productivity of winter wheat and maize crops. In: Application of remote diagnostic methods in agriculture, 90—92 (Nauk. dumka, Kiev, 1989) [in Russian].

3. Kleshnin A. F. Plant and Light, 456 p. (Izd-vo AN SSSR, Moscow, 1954) [in Russian].

4. Kondratyev K. Ya., Kozoderov V. V., Fedchenko P. P. Airspace Studies of Soils and Vegetation, 229 p. (Hydrometeoizdat, Leningrad, 1986) [in Russian].

5. Kondratyev K. Ya., Fedchenko P. P. Spectral reflectance and recognition of vegetation, 216 p. (Nauka, Leningrad, 1987) [in Russian].

6. Kochubey S. M., Kobets N. I., Shadchina T. M. Spectral Properties of Plants as a Basis for the Methods of Remote Diagnostic, 135 p. (Nauk. dumka, Kiev, 1990) [in Russian].

7. Rachkulik V. I., Sitnikova M. V. Methodological and experimental bases for the use of optical properties of soil-vegetation objects in the determination of vegetation parameters. In: Application of remote diagnostic methods in agriculture, 33—40 (Nauk. dumka, Kiev, 1989) [in Russian].

8. Manual on the conduct of visual air route agrometeorological surveys, 103 p. (Gidrometeoizdat, Moscow, 1971) [in Russian].

9. Blackburn G. A. Evaluating spectral indices for tracking phenological changes in canopy pigment composition. Proc. of 23rd Annual Conf. Remote Sensing Society, 2—4 September 1997, 94—99 (Reading, UK, 1997).

10. Chappelle E. W., Kim M. S., McMurtrey J. E. Ratio analysis of reflectance spectra: an algorithm for the remote estimation of the concentration of chlorophyll A, B and carotenoids in soybean leaves. Remote Sensing of Environment, 39, 239—247 (1992).

11. Csornai G., dr. Dalia O., Farkasfaly J., Nádor G. Crop Inventory Studies Using Landsat Data on Large Area in Hungary. Appl. Remote Sensing Agriculture, 159—165 (Butterworths, 1990).

12. Gates D. M., Keegan H. J., Schleter J. S., Weidner V. R. Spectral properties of plants. Appl. Opt., 4 (1), 11—20 (1965).

13. Joint Research Centre, The MARS Project: Overview and Perspectives, EUR 15599, EN (Luxemburg, 1994).

14. MERA National Focal Points, MERA-92 Project Interim and Final Reports. (4 activities), Warsaw, Sofia, Prague, Bratislava, Bucharest, Budapest (1995).

15. Vogelmann J. E., Rock B. N., Moss D. M. Red edge spectral characterization of phenological change and insect related damage in sugar maple leaves. Internal. J. Remote Sensing, 14, 1563—1575 (1993).

16. Wooley J. T. Reflectance and transmittance of light by leaves. Plant. Physiology, 47 (5), 656—662 (1971).