An Acoustic and Lexical Analysis of Emotional Valence in Spontaneous Speech: Autobiographical Memory Recall in Older Adults. - Deniece S. Nazareth; Ellen Tournier; Sarah Leimkötter; Esther Janse; Dirk Heylen; Gerben J. Westerhof; Khiet P. Truong (INTERSPEECH, 2019)