@article{700215,
     title = {On bounded solutions of a certain differential equation},
     booktitle = {Differential Equations and Their Applications},
     series = {GDML\_Books},
     publisher = {Slovensk\'e pedagogick\'e nakladate\v lstvo},
     address = {Bratislava},
     year = {1967},
     pages = {213-215},
     zbl = {0188.14501},
     url = {http://dml.mathdoc.fr/item/700215}
}

Neuman, F. On bounded solutions of a certain differential equation, dans Differential Equations and Their Applications, GDML_Books,  (1967), pp. 213-215. http://gdmltest.u-ga.fr/item/700215/