PageHeader : Funkcialaj Ekvacioj, 27 (1984), 25-48 Title : Perturbation Method for Linear Title : Periodic Systems I AuthorInfo : By AuthorInfo : Tosiya SAITO and Ichiro TSUKAMOTO AuthorInfo : (Keio University, Japan) section : 1. Let there be given a linear system section : 2. We begin with following general consideration. section : 3. To simplify the description, we introduce following definitions. section : 4. section : 5. section : 6. section : 7. section : 8. section : References