Studies In Mathematics Volume 23 Studies In Partial Differential Equations
Walter Littman1982 年出版268 页ISBN:
PERTURBATION METHODS IN APPLIED MATHEMATICS
J. KEVORKIAN1981 年出版558 页ISBN:0387905073
TECHNICIAN MATHEMATICS LEVEL 2
J.O.BIRD AND A.J.C.MAY1978 年出版373 页ISBN:0582416167