@article{10_5817_AM2012_4_261,
     author = {Yankson, Ernest},
     title = {Existence and positivity of solutions for a nonlinear periodic differential equation},
     journal = {Archivum mathematicum},
     pages = {261--270},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {2012},
     doi = {10.5817/AM2012-4-261},
     mrnumber = {3007609},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5817/AM2012-4-261/}
}