HARBAUGH, John W. A Computer Method for Four-Variable Trend Analysis Illustrated by a Study of Oil-Gravity Variations in Southeastern Kansas. Bulletin (Kansas Geological Survey), [S. l.], n. 171, p. 1–58, 1964. Disponível em: https://journals.ku.edu/kgsbulletin/article/view/22196.. Acesso em: 3 nov. 2024.