@article{SEMR_2008_5_a21,
     author = {A. E. Gutman and A. G. Kusraev and S. S. Kutateladze},
     title = {The {Wickstead} {Problem}},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {293--333},
     publisher = {mathdoc},
     volume = {5},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2008_5_a21/}
}