@article{10_5817_AM2023_1_85,
     author = {Onitsuka, Masakazu},
     title = {Approximation of limit cycle of differential systems with variable coefficients},
     journal = {Archivum mathematicum},
     pages = {85--97},
     publisher = {mathdoc},
     volume = {59},
     number = {1},
     year = {2023},
     doi = {10.5817/AM2023-1-85},
     mrnumber = {4563019},
     zbl = {07675577},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5817/AM2023-1-85/}
}