1. Some characterizations of unimodal distribution functions;Bertin;Z. Wahrsch. Verw. Gebiete,1981
2. Characterizations of unimodal distribution functions;Bertin,1981
3. Concentration functions;Hengartner,1973
4. A characterization of strictly unimodal distribution functions by their concentration functions;Hengartner;Publ. Inst. Statist. Paris,1978
5. Some results for discrete unimodality;Keilson;J. Amer. Statist. Assoc.,1971