共 15 条
[3]
Ballmann W., 1985, MANIFOLDS NONPOSITIV, DOI DOI 10.1007/978-1-4684-9159-3
[5]
EBERLEIN P, 1983, J DIFFER GEOM, V18, P209
[6]
EBERLEIN P, 1980, ANN MATH, V111, P435, DOI 10.2307/1971104
[8]
Gromov M., 1978, J DIFFERENTIAL GEOME, V13, P223
[9]
LAWSON HB, 1972, J DIFFER GEOM, V7, P221
[10]
Mostow G.D., 1973, ANN MATH STUD, V78