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- [7] EFFECTS OF COLD HARDENING ON CRYOPRESERVATION OF AXILLARY PEAR (PYRUS-COMMUNIS L CV BEURRE HARDY) SHOOT TIPS OF INVITRO PLANTLETS COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE III-SCIENCES DE LA VIE-LIFE SCIENCES, 1990, 310 (06): : 265 - 272