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- [7] 2ND ORDER SUBELLIPTIC OPERATORS COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE, 1989, 308 (14): : 437 - 440
- [9] On 2nd Order Calculi of Individuals THEORIA-REVISTA DE TEORIA HISTORIA Y FUNDAMENTOS DE LA CIENCIA, 2009, 24 (02): : 169 - 202