From 1970 to 1974 he was research fellow at the French National Centre for Scientific Research and during 1975 he held a visiting position at Queen's University at Kingston in Canada.
fɹʌm nˈaɪntiːnhˈʌndɹɪd sˈɛvənti tə nˈaɪntiːnhˈʌndɹɪd sˈɛvənti fˈoːɹ hiː wʌz ɹᵻsˈɜːtʃ fˈɛloʊ æt ðə fɹˈɛntʃ nˈæʃənəl sˈɛntɚ fɔːɹ saɪəntˈɪfɪk ɹᵻsˈɜːtʃ ænd dˈʊɹɹɪŋ nˈaɪntiːnhˈʌndɹɪd sˈɛvənti fˈaɪv hiː hˈɛld ɐ vˈɪzɪɾɪŋ pəzˈɪʃən æt kwˈiːnz jˌuːnɪvˈɜːsᵻɾi æt kˈɪŋstən ɪn kˈænədə.