@article{10_4064_sm_91_3_231_239,
     author = {Vladimir Rako\v{c}evi\'c and Jaroslav Zem\'anek},
     title = {Lower s-numbers and their asymptotic behaviour},
     journal = {Studia Mathematica},
     pages = {231--239},
     publisher = {mathdoc},
     volume = {91},
     number = {3},
     year = {1988},
     doi = {10.4064/sm-91-3-231-239},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-91-3-231-239/}
}