@article{10_4153_S0008439523000954,
     author = {Shen, Zhongmin and Zhao, Runzhong},
     title = {On the {Pontrjagin} classes of spray manifolds},
     journal = {Canadian mathematical bulletin},
     pages = {544--553},
     year = {2024},
     volume = {67},
     number = {3},
     doi = {10.4153/S0008439523000954},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439523000954/}
}