1.
Science
; 315(5810): 322-4, 2007 Jan 19.
Artigo
em Inglês
| MEDLINE
| ID: mdl-17234927
2.
Aerosp Am
; 41(10): 6-7, 38-40, 2003 Oct.
Artigo
em Inglês
| MEDLINE
| ID: mdl-14552343
RESUMO
NASA: Total expenditures for space activities by civilian governments totaled $20.3 billion in 2002. National summaries by expenditure and type of flight are provided.^ieng