On the ultimate boundedness of the solutions of certain differential equations
Compositio Mathematica, Tome 8 (1951), pp. 142-156. 
@article{CM_1951__8__142_0,
     author = {Newman, H. A.},
     title = {On the ultimate boundedness of the solutions of certain differential equations},
     journal = {Compositio Mathematica},
     pages = {142--156},
     publisher = {Kraus Reprint},
     volume = {8},
     year = {1951},
     mrnumber = {39876},
     zbl = {0039.31201},
     language = {en},
     url = {http://www.numdam.org/item/CM_1951__8__142_0/}
}
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Newman, H. A. On the ultimate boundedness of the solutions of certain differential equations. Compositio Mathematica, Tome 8 (1951), pp. 142-156. http://www.numdam.org/item/CM_1951__8__142_0/