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Citation: A. Gutierrez-moreno et al., Trigonometric distances of planetary nebulae, PUB AST S P, 111(763), 1999, pp. 1163-1168

Authors: Gutierrez-Moreno, A Moreno, H Costa, E

Citation: A. Gutierrez-moreno et al., Spectroscopic observations of some S-type symbiotic stars, PUB AST S P, 111(759), 1999, pp. 571-586