@article{10_4171_dm_798,
     author = {Reinhard Brocks},
     title = {Comparison {Theory} of {Distance} {Spheres} along {Geodesics}},
     journal = {Documenta mathematica},
     pages = {2241--2302},
     year = {2020},
     volume = {25},
     doi = {10.4171/dm/798},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/798/}
}