@article{MM2_1977__21_154461,
     author = {Keijo V\"a\"an\"anen},
     title = {On {Lower} {Bounds} for {Polynomials} in the {Values} of {E-Functions.}},
     journal = {Manuscripta mathematica},
     pages = {173--180},
     publisher = {mathdoc},
     volume = {21},
     year = {1977},
     zbl = {0356.10026},
     url = {http://geodesic.mathdoc.fr/item/MM2_1977__21_154461/}
}