Lidar Observations of Aerosol Disturbances of the Stratosphere over Tomsk (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>56.5</mml:mn><mml:mo>∘</mml:mo></mml:msup></mml:math>N;<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>85.0</mml:mn><mml:mo>∘</mml:mo></mml:msup></mml:math>E) in Volcanic Activity Period 2006–2011
International journal of optics