@article{GDZPPN00046242X,
title = {Linear Growth Harmonic Functions on Complete Manifolds with Nonnegative Ricci Curvature.},
journal = {Geometric and functional analysis},
volume = {5},
year = {1995},
pages = {948-954},
zbl = {0871.53032},
url = {http://dml.mathdoc.fr/item/GDZPPN00046242X}
}
Cheeger, J.; Colding, T.H. Linear Growth Harmonic Functions on Complete Manifolds with Nonnegative Ricci Curvature.. Geometric and functional analysis, Tome 5 (1995) pp. 948-954. http://gdmltest.u-ga.fr/item/GDZPPN00046242X/