Dragulete, Oana MihaelaRatiu, Tudor S.RodrÃguez-Olmos, Miguel2008-11-202008-11-202008-11-20200710.1090/S0002-9947-07-04229-8https://infoscience.epfl.ch/handle/20.500.14299/31536WOS:000246612600007Singular cosphere bundle reductiontext::journal::journal article::research article