@article{MM2_1974__13_154273,
     author = {Bruce L.R. Shawyer},
     title = {Iteration {Products} of {Methods} of {Summability} and {Natural} {Scales.}},
     journal = {Manuscripta mathematica},
     pages = {355--364},
     publisher = {mathdoc},
     volume = {13},
     year = {1974},
     zbl = {0292.40008},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__13_154273/}
}