@article{10_4064_sm_31_5_531_533,
     author = {K\^osaku Yosida},
     title = {The existence of the potential operator associated with an equicontinuous semigroup of class $(C_0)$},
     journal = {Studia Mathematica},
     pages = {531--533},
     publisher = {mathdoc},
     volume = {31},
     number = {5},
     year = {1968},
     doi = {10.4064/sm-31-5-531-533},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-31-5-531-533/}
}