@article{AUPO_1978_17_1_a4,
     author = {Stan\v{e}k, Svatoslav},
     title = {The characteristic multipliers of a block and of an inverse block of second-order linear differential equations with $pi$-periodic coefficients},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {39--51},
     year = {1978},
     volume = {17},
     number = {1},
     mrnumber = {055403},
     zbl = {0424.34045},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1978_17_1_a4/}
}