@article{10_1090_S1079_6762_03_00120_3,
     author = {Petrunin, Anton},
     title = {Harmonic functions on {Alexandrov} spaces and their applications},
     journal = {Electronic research announcements of the American Mathematical Society},
     pages = {135--141},
     publisher = {mathdoc},
     volume = {09},
     year = {2003},
     doi = {10.1090/S1079-6762-03-00120-3},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S1079-6762-03-00120-3/}
}