The eigenvalue problem in the one-dimensional periodic field of force

[1] Linear second order differential equations with periodic coefficients [J]. MATHEMATISCHE ANNALEN, 1913, 73 : 371 - 412

[2] Haupt O, 1915, MATH ANN, V76, P67

[3] Haupt O, 1919, MATH ANN, V79, P278

[4] KRONIG RDL, 1930, P ROY SOC A, V130, P499

[5] STRUTT JO, 1929, MATH ANN, V101, P559

[1] Linear second order differential equations with periodic coefficients [J]. MATHEMATISCHE ANNALEN, 1913, 73 : 371 - 412

[2] Haupt O, 1915, MATH ANN, V76, P67

[3] Haupt O, 1919, MATH ANN, V79, P278

[4] KRONIG RDL, 1930, P ROY SOC A, V130, P499

[5] STRUTT JO, 1929, MATH ANN, V101, P559