Is an ordinal class structure useful in classifier learning?

Jens C. Huhn Eyke Hüllermeier Is an ordinal class structure useful in classifier learning? 45-67 2008 1 IJDMMM 1 http://dx.doi.org/10.1504/IJDMMM.2008.022537 db/journals/ijdmmm/ijdmmm1.html#HuhnH08