scientific article published in 1985
scientific article published in 1985
article by Detlef Gromoll & Wolfgang Meyer published July 1969 in Annals of Mathematics
article by Jeff Cheeger & Detlef Gromoll published November 1972 in Annals of Mathematics
scientific article published in 1980
scientific article published in 1969
scientific article published in 1985
scientific article published in 1997
scientific article published in 1990
scientific article published in 2001
scientific article published in 1988
scientific article published in 1971
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