Audiovisual

Spontaneous lecture in French of August 11, 1984 - Multi-zone DVD - PAL format - Length: 57’ – Subtitles in 9 languages: German, English, Spanish, French, Italian, Dutch, Polish, Portuguese, Russian

Spontaneous lecture in French of September 19, 1982 - Multizone DVD - PAL Format - Length: 1h 09' - Subtitles in 13 languages: German, English, Spanish, French, Greek, Hungarian, Italian, Dutch, Polish, Portuguese, Romanian, Russian.

Spontaneous lecture in French of April 24, 1983 - Multi-zone DVD - PAL format - Length: 50' - Subtitles in 11 languages: German, English, Bulgarian, Spanish, French, Italian, Portuguese, Dutch, Norwegian, Romanian, Russian.

Spontaneous lecture in French of April 22, 1982 - Multi-zone DVD - PAL format - Length: 40' - Subtitles in 12 languages: German, English, Bulgarian, Spanish, French, Italian, Norwegian, Polish, Portuguese, Romanian, Russian, Czech.

Spontaneous lecture in French of April 20, 1981 - Multi-zone DVD - PAL format - Length: 59' - Subtitles in 12 languages: German, English, Bulgarian, Spanish, French, Italian, Dutch, Polish, Portuguese, Romanian, Russian, Czech.

Spontaneous lecture in French of June 16, 1985 - Multi-zone DVD - PAL format - Length: 1h 20' - Subtitles in 12 languages: German, English, Bulgarian, Spanish, French, Italian, Dutch, Polish, Portuguese, Romanian, Russian, Czech.

Spontaneous lecture in French of August 8, 1981 - Multi-zone DVD - PAL format - Length: 56' - Subtitles in 12 languages: German, English, Spanish, French, Greek, Italian, Dutch, Polish, Portuguese, Romanian, Russian, Czech.

Spontaneous lecture un French of March 29, 1980 - Multizone DVD - PAL Format - Length: 58' - Subtitles in 12 languages: German, English, Spanish, French, Greek, Hungarian, Italian, Dutch, Polish, Portuguese, Romanian, Russian.

Spontaneous lecture in French of February 14, 1981 - Multi-zone DVD - PAL format - Length: 42' 20'' - Subtitles in 14 languages: German, English, Spanish, French, Greek, Hungarian, Italian, Dutch, Polish, Portuguese, Romanian, Russian, Turkish.

Spontaneous lecture of August 6, 1982 - Multi-zone DVD - PAL Format - Length: 61' - Subtitles in 14 languages: German, English, Spanish, French, Greek, Hungarian, Italian, Dutch, Polish, Portuguese, Romanian, Russian, Turkish.