@article{BUMI_1999_8_2B_2_a13,
     author = {Berndt, J\"urgen and Vanhecke, Lieven},
     title = {$\phi$-symmetric spaces and weak symmetry},
     journal = {Bollettino della Unione matematica italiana},
     pages = {389--392},
     publisher = {mathdoc},
     volume = {Ser. 8, 2B},
     number = {2},
     year = {1999},
     zbl = {0978.53091},
     mrnumber = {1456247},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1999_8_2B_2_a13/}
}