Text ( visual ) : unmediated Structure de l'univers / E. L. Schatzman. -- Paris : Hachette , c1968. -- 253 p. : ill. ; 19 cm. -- L'Univers des connaissances. -- (BD05548126) ; https://ci.nii.ac.jp/ncid/BD05548126 Author Heading(s): Schatzman, Evry L.. -- Subject Heading(s): LCSH : Astronomy -- Popular works