+++3 статьи Journal of Applied Spectroscopy

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Добрый день!
Помогите пожалуйста со следующими статьями:
Journal of Applied Spectroscopy
On the possibility of calculating the valence vibrations of the P=O group of certain alkyl(aryl) phosphonates and aryl phosphates
Volume 7, Number 3, 262-265

DOI:

http://dx.doi.org/10.1007/BF00604252

Spectra of phosphate esters in the 900–1400 cm−1 region
Volume 2, Number 1, 36-38

DOI:

http://dx.doi.org/10.1007/BF00658082

Splitting of the P=O band in the infrared spectra of various cresyl phosphates
Volume 9, Number 2, 798-800

DOI:

http://dx.doi.org/10.1007/BF00866036

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Спасибо огромное