@article{10_1007_s10587_015_0190_5,
     author = {Mikulski, W{\l}odzimierz M.},
     title = {Fiber product preserving bundle functors as modified vertical {Weil} functors},
     journal = {Czechoslovak Mathematical Journal},
     pages = {517--528},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {2015},
     doi = {10.1007/s10587-015-0190-5},
     mrnumber = {3360441},
     zbl = {06486961},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-015-0190-5/}
}