Hipótesis del zoológico (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hipótesis del zoológico" in Spanish language version.

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doi.org

Ball, John A. (Jul 1973). «The Zoo Hypothesis». Icarus 19 (3): 347-349. Bibcode:1973Icar...19..347B. doi:10.1016/0019-1035(73)90111-5.

Lytkin, V.; Finney, B.; Alepko, L. (December 1995). «Tsiolkovsky – Russian Cosmism and Extraterrestrial Intelligence». Quarterly Journal of the Royal Astronomical Society 36 (4): 369. Bibcode:1995QJRAS..36..369L.
Ball, John A. (Jul 1973). «The Zoo Hypothesis». Icarus 19 (3): 347-349. Bibcode:1973Icar...19..347B. doi:10.1016/0019-1035(73)90111-5.