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Spin dependent fragmentation functions for heavy flavor quarks to fragmentinto heavy baryons are calculated in a quark-diquark model. The production ofintermediate spin 1/2 and 3/2 excited states is explicity included. $\Lambda_b$, $\Lambda_c$ and $\Xi_c$ production rate and polarization at LEP energies arecalculated and, where possible, compared with experiment. A different approach,also relying on a heavy quark-diquark model, is proposed for the small momentumtransfer inclusive production of polarized heavy flavor hyperons. The predicted$\Lambda_c$ polarization is roughly in agreement with experiment.Comment: LaTeX2e 11 pages with 4 PostScript figures. To be published in  Proceedings of the International Workshop ``Symmetries and spin'',  Praha-SPIN-200

Spin dependent fragmentation functions for heavy flavor baryons and single heavy hyperon polarization