Synthesis and Spectral and Structural Elucidation of Some Pyridinium Betaines of Squaric Acid : Potential Materials for Nonlinear Optical Applications

  • Kolev B
  • Yancheva D
  • Stoyanov S
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  • By Tsonko M Kolev

  • Denitsa Y Yancheva

  • Stefan I Stoyanov

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