@article{JOLT_2008_18_4_a7,
     author = {F. Valiquette},
     title = {Structure {Equations} of {Lie} {Pseudo-Groups}},
     journal = {Journal of Lie Theory},
     pages = {869--895},
     year = {2008},
     volume = {18},
     number = {4},
     doi = {10.5802/jolt.530},
     zbl = {1173.58002},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.530/}
}