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Gravitational lens equation: critical solutions and magnification near folds and cusps / Alexandrov, A. N., Koval, S. M., Zhdanov, V. I. (2012)
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 web address of the page http://jnas.nbuv.gov.ua/article/UJRN-0000826958 Advances in Astronomy and Space Physics
  А  - 2018  /      Issue (2012,  Vol. 2, Iss. 2) 
 Alexandrov A. N., Koval S. M., Zhdanov V. I.Gravitational lens equation: critical solutions and magnification near folds and cusps
 
 
 Cite:Alexandrov, A. N., Koval, S. M., Zhdanov, V. I. (2012). Gravitational lens equation: critical solutions and magnification near folds and cusps. Advances in Astronomy and Space Physics, 2 (2), 184-187. http://jnas.nbuv.gov.ua/article/UJRN-0000826958
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