A. Y. Spasov (Spasov, A. Y.)

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  Lasers and Their Applications: Proceedings of the 4th Summer School on Quantum Electronics, "Lasers&Their Applications" Sept 29 to Oct 4 1986 Sunny
  by A. Y. Spasov
  Hardcover, World Scientific Pub Co Inc, ISBN 9971503204 (9971-5-0320-4)
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  Lasers: Physics and Applications Proceedings of the 5th International School on Quantum Electronics, Sunny Beach, Bulgaria, Sept 26-Oct 1., 1988
  by A. Y. Spasov
  Hardcover, World Scientific Pub Co Inc, ISBN 9971508109 (9971-5-0810-9)
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  Microwave Physics and Technique: Proceeding of the 6th International School on 2-7 Cot 1989 Varna, Bulgaria
  by A.Y. Sapsov, M.A. Tsankov
  Hardcover, World Scientific Pub Co Inc, ISBN 9810200900 (981-02-0090-0)
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  Microwave Physics and Technique: Proceedings of the Seventh International School
  by A. Y. Spasov
  Hardcover, World Scientific Pub Co Inc, ISBN 9810209207 (981-02-0920-7)
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  Proceedings of the 5th International School on Microwave Physics and Technique
  by A. Y. Spasov, B International School on Microwave Physics and Technique 1987 Varna
  Hardcover, World Scientific Pub Co Inc, ISBN 9971504294 (9971-5-0429-4)