ヴォルフガンク・ウォルター
Redheffer, R., & Walter, W. (1980). Invariant sets for systems of partial differential equations II. First-order and elliptic equations. Archive for Rational Mechanics and Analysis, 73(1), 19-29.
Bondge, B. K., Pachpatte, B. G., & Walter, W. (1980). On generalized Wendroff type inequalities and their applications. Nonlinear Analysis: Theory, Methods & Applications, 4(3), 491-495.
Redheffer, R., & Walter, W. (1984). Solution of the stability problem for a class of generalized Volterra prey-predator systems. Journal of Differential Equations, 52(2), 245-263.