@article{EXMA_1994__3_1_228822,
     author = {Thunberg, Hans},
     title = {Feigenbaum numbers of certain flat-top families.},
     journal = {Experimental mathematics},
     pages = {51--57},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1994},
     zbl = {0807.58035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_1994__3_1_228822/}
}