1. On imbedding of nuclear spaces into the space of all infinitely differentiable functions on a straight line;Bessaga;Dokl. Akad. Nauk SSSR,1960
2. Perfect Fréchet spaces;Dubinsky;Math. Ann.,1967
3. Criterion for nuclearity in terms of approximative dimension;Dynin;Bull. Acad. Pol. Sci.,1960
4. Über die Einbettung der nuklearen Räume in (s)0;Komura;Math. Ann.,1965
5. The approximative dimension and bases in nuclear spaces;Mitiagin;Usp. Mat. Nauk,1961