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- [8] CONTROLLABILITY FOR PARTIAL-DIFFERENTIAL EQUATIONS OF PARABOLIC TYPE SIAM JOURNAL ON CONTROL, 1974, 12 (03): : 389 - 400
- [10] NORMAL FORMS FOR PARABOLIC PARTIAL-DIFFERENTIAL EQUATIONS ANNALES DE L INSTITUT HENRI POINCARE-PHYSIQUE THEORIQUE, 1993, 58 (03): : 287 - 308