@article{10_21136_AM_1992_104503,
     author = {Tumajer, Franti\v{s}ek},
     title = {Derivative of the norm of a linear mapping and its application to differential equations},
     journal = {Applications of Mathematics},
     pages = {193--199},
     publisher = {mathdoc},
     volume = {37},
     number = {3},
     year = {1992},
     doi = {10.21136/AM.1992.104503},
     mrnumber = {1157455},
     zbl = {0767.34045},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1992.104503/}
}