Regarding the absorption of penetrating gamma rays.

[1] Chao, 1930, P NAT ACAD SCI, V16, P431

[2] Interaction of hard gamma-rays with atomic nuclei [J]. NATURE, 1933, 132 : 709 - 709

[3] CHAO CY, 1932, P ROY SOC, V135, P205

[4] Materialisation and transmutation electrons. [J]. JOURNAL DE PHYSIQUE ET LE RADIUM, 1933, 4 : 494 - 500

[5] Curie I, 1933, CR HEBD ACAD SCI, V196, P1105

[6] CURIE L, 1933, C R, V196, P1581

[7] FERMI E, 1933, PHYS REV, V44, P511

[8] Gentner W, 1933, CR HEBD ACAD SCI, V197, P403

[9] GENTNER W, 1933, C R, V197, P1111

[10] Gray LH, 1931, P CAMB PHILOS SOC, V27, P103

[1] Chao, 1930, P NAT ACAD SCI, V16, P431

[2] Interaction of hard gamma-rays with atomic nuclei [J]. NATURE, 1933, 132 : 709 - 709

[3] CHAO CY, 1932, P ROY SOC, V135, P205

[4] Materialisation and transmutation electrons. [J]. JOURNAL DE PHYSIQUE ET LE RADIUM, 1933, 4 : 494 - 500

[5] Curie I, 1933, CR HEBD ACAD SCI, V196, P1105

[6] CURIE L, 1933, C R, V196, P1581

[7] FERMI E, 1933, PHYS REV, V44, P511

[8] Gentner W, 1933, CR HEBD ACAD SCI, V197, P403

[9] GENTNER W, 1933, C R, V197, P1111

[10] Gray LH, 1931, P CAMB PHILOS SOC, V27, P103