no. 1
Theory of gravitation. The problem of stationary states, and the apparatus of the echo phenomenon in radiographic transmission
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 2, Tome 6 (1937) no. 1, pp. 29-40. 
@article{ASNSP_1937_2_6_1_29_0,
     author = {Glenn, Oliver E.},
     title = {Theory of gravitation. {The} problem of stationary states, and the apparatus of the echo phenomenon in radiographic transmission},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {29--40},
     publisher = {Scuola normale superiore},
     volume = {Ser. 2, 6},
     number = {1},
     year = {1937},
     zbl = {0015.37605},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1937_2_6_1_29_0/}
}
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%0 Journal Article
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%D 1937
%P 29-40
%V 6
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%F ASNSP_1937_2_6_1_29_0
Glenn, Oliver E. Theory of gravitation. The problem of stationary states, and the apparatus of the echo phenomenon in radiographic transmission. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 2, Tome 6 (1937) no. 1, pp. 29-40. http://archive.numdam.org/item/ASNSP_1937_2_6_1_29_0/