Willems, Jan C. The analysis of feedback systems / Jan C. Willems. — Cambridge; London: MIT Press, 1971. — 1 PDF (xv, 188 pages): ill. — (The MIT Press research monograph series). — "Parts of this monograph appeared in the author's doctoral dissertation entitled 'Nonlinear harmonic analysis' ... 1968.". — Restricted to subscribers or individual electronic text purchasers. — Доступ по паролю из сети Интернет (чтение, печать). — Mode of access: World Wide Web. — <URL:https://ieeexplore.ieee.org/xpl/bkabstractplus.jsp?bkn=6267357>. — Текст: электронный
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