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- [3] Closed geodesics in simply connected Riemannian spaces of negative curvature Siberian Mathematical Journal, 2000, 41 : 880 - 883
- [6] SURFACES OF NEGATIVE EXTERNAL CURVATURE IN RIEMANNIAN SPACE WITH NON-POSITIVE RIEMANNIAN CURVATURE DOKLADY AKADEMII NAUK SSSR, 1970, 194 (04): : 747 - &
- [10] The circle problem on surfaces of variable negative curvature Monatshefte für Mathematik, 1997, 123 : 61 - 70