Invariants when the transformation is infinitesimal, and their relevance in bio-mathematics and in the theory of terrestrial magnetism
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 8 (1954) no. 1-2, pp. 1-42. 
@article{ASNSP_1954_3_8_1-2_1_0,
     author = {Glenn, Oliver E.},
     title = {Invariants when the transformation is infinitesimal, and their relevance in bio-mathematics and in the theory of terrestrial magnetism},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {1--42},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 8},
     number = {1-2},
     year = {1954},
     mrnumber = {68083},
     zbl = {0055.32301},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1954_3_8_1-2_1_0/}
}
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Glenn, Oliver E. Invariants when the transformation is infinitesimal, and their relevance in bio-mathematics and in the theory of terrestrial magnetism. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 8 (1954) no. 1-2, pp. 1-42. http://archive.numdam.org/item/ASNSP_1954_3_8_1-2_1_0/