1. K.-D. Bierstedt, I. The approximation property for weighted function spaces, Bonner Math. Schriften 81(1975), 3–25; II. Tensor products of weighted spaces, Bonner Math. Schriften 81(1975), 26-58.
2. K. D. Bierstedt, J. Bonet, Stefan Heinrich’s density condition for Fréchet spaces and the characterization of the distinguished Köthe echelon spaces, Math. Nachr. 135(1988), 149–180 (also see: La condition de densité et les espaces échelonnés distingués, C. R. Acad. Sci. Paris, t. 303, Série I, n0 10, 1986, pp. 459-462).
3. K.-D. Bierstedt, R. Meise, Bemerkungen über die Approximationseigenschaft lokalkonvexer Funktionenräume, Math. Ann. 209(1974), 99–107.
4. K. D. Bierstedt, R. Meise, Distinguished echelon spaces and the projective description of weighted inductive limits of type % MathType!MTEF!2!1!+-% feaaeaart1ev0aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXanrfitLxBI9gBaerbd9wDYLwzYbItLDharqqt% ubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq% -Jc9vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0x% fr-xfr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyuam% aaBaaaleaacaaIXaGaaGimaaqabaGccqGH9aqpciGGSbGaaiOBaiaa% ysW7caWGRbWaaSbaaSqaaiaadsfacaaIXaaabeaakiaac+cacaWGRb% WaaSbaaSqaaiaadsfacaaIYaaabeaakiabg2da9iabgkHiTmaabmaa% baGaamyramaaBaaaleaacaWGHbaabeaakiaac+cacaWGsbaacaGLOa% GaayzkaaGaey41aq7aaiWaaeaadaqadaqaaiaadsfadaWgaaWcbaGa% aGOmaaqabaGccqGHsislcaWGubWaaSbaaSqaaiaaigdaaeqaaaGcca% GLOaGaayzkaaGaai4laiaacIcacaWGubWaaSbaaSqaaiaaikdaaeqa% aOGaaGjbVlaadsfadaWgaaWcbaGaamysaaqabaGccaGGPaaacaGL7b% GaayzFaaaaaa!5C4A! ${\cal V}_dC(X)$ , pp. 169-226 in: Aspects of Mathematics and its Applications, Elsevier Science Publ., North-Holland Math. Library, 1986.
5. K. D. Bierstedt, R. Meise, Weighted inductive limits and their projective descriptions, Doğa Tr. J. Math. 10,1(1986) (Special Issue: Proceedings of the Silivri Conference 1985), 54-82.