51 | Add to Reading ListSource URL: www.vakuumenergie.deLanguage: English - Date: 2011-05-21 16:40:04
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52 | Add to Reading ListSource URL: www.benthamscience.comLanguage: English - Date: 2013-05-13 07:27:05
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53 | Add to Reading ListSource URL: www.ptep-online.comLanguage: English - Date: 2010-02-18 18:38:59
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54 | Add to Reading ListSource URL: www.nobelprize.orgLanguage: English - Date: 2006-05-31 16:53:27
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55 | Add to Reading ListSource URL: www.centauri-dreams.orgLanguage: English - Date: 2007-11-07 09:19:31
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56 | Add to Reading ListSource URL: esto.nasa.govLanguage: English - Date: 2007-06-06 09:55:50
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57 | Add to Reading ListSource URL: www.itp.kit.eduLanguage: English - Date: 2010-03-26 10:05:36
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58 | Add to Reading ListSource URL: damtp.cam.ac.ukLanguage: English - Date: 2013-01-02 04:51:16
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59 | Add to Reading ListSource URL: www.mpi-hd.mpg.deLanguage: English - Date: 2007-12-18 08:25:20
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60 | Add to Reading ListSource URL: www.niac.usra.eduLanguage: English - Date: 2012-10-10 14:59:13
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