Tramontana, FabioFabioTramontanaWesterhoff, Frank H.Frank H.Westerhoff0000-0003-1666-4103Gardini, LauraLauraGardini2022-01-212022-01-2120130165-1889https://fis.uni-bamberg.de/handle/uniba/52933engThe bull and bear market model of Huang and Day : Some extensions and new resultsarticle10.1016/j.jedc.2013.06.005https://zh.booksc.eu/book/22769092/7a1f28