Le Sage's theory was studied by Radzievskii and Kagalnikova (1960),[24] Shneiderov (1961),[25] Buonomano and Engels (1976),[26] Adamut (1982),[27] Jaakkola (1996),[28] Tom Van Flandern (1999),[29] and Edwards (2007).[30] A variety of Le Sage models and related topics are discussed in Edwards, et al.[31]