https://123dok.net/document/zwv8n11q-en-fr-mixed-models-with-latent-structure-for-heterogeneous-multivariate-longitudinal-data-application-to-the-study-of-cognitive-aging-and-dementia-modeles-mixtes-a-structure-latente-pour-donneeslongitudinales-multivariees-heterogenes-application-a-l-etude.html