Troche-Boggino, A.E. (1998). "Centre for Astronomy for Paraguay"(PDF). Selected Papers on Space Science Education, Remote Sensing, and Small Satellites. Seminars of the United Nations Programme on Space Applications. 9: 167. Bibcode:1998UNPSA...9..167T.
Troche-Boggino, A.E. (1998). "Centre for Astronomy for Paraguay"(PDF). Selected Papers on Space Science Education, Remote Sensing, and Small Satellites. Seminars of the United Nations Programme on Space Applications. 9: 167. Bibcode:1998UNPSA...9..167T.