@misc{ND_2009_5_1_a13,
     title = {G.\,B.~Jeffery and {G.~Hamel.} {Brief} biography},
     journal = {Russian journal of nonlinear dynamics},
     pages = {135--136},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2009_5_1_a13/}
}