On the retieval of hafnium and the contemporary knowledge of this element.

[1] BOHR N, 1923, Z PHYS, V12, P341

[2] BRAUNERS B, ABEGGS HDB, V3, P795

[3] BRONSTED JN, 1922, Z CH, V124, P22

[4] Langmuir's theory of the arrangement of electrons in atoms and molecules [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1921, 43 : 1602 - 1609

[5] COSTER D, 1923, NATURE 0120

[6] Coster D., 1923, NATURWISSENSCHAFTEN, V11, P133

[7] HANSEN HM, 1923, NATURE 0407

[8] HONIGSCHMID O, 1918, WIEN AKAD BER, V125, P13

[9] KING HS, 1922, AM SOCIOL, V44, P328

[10] STMEYER, 1908, WIEN AKAD BER, V117, P995

[1] BOHR N, 1923, Z PHYS, V12, P341

[2] BRAUNERS B, ABEGGS HDB, V3, P795

[3] BRONSTED JN, 1922, Z CH, V124, P22

[4] Langmuir's theory of the arrangement of electrons in atoms and molecules [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1921, 43 : 1602 - 1609

[5] COSTER D, 1923, NATURE 0120

[6] Coster D., 1923, NATURWISSENSCHAFTEN, V11, P133

[7] HANSEN HM, 1923, NATURE 0407

[8] HONIGSCHMID O, 1918, WIEN AKAD BER, V125, P13

[9] KING HS, 1922, AM SOCIOL, V44, P328

[10] STMEYER, 1908, WIEN AKAD BER, V117, P995