1. Increase in viscosity of asphalts with time;Traxler;Proc Am Soc Test Mater,1936
2. Development of internal structure in asphalt with time;Traxler;Proc Am Soc Test Mater,1937
3. Steric hardening of asphalts;Brown;Proc Assoc Asphalt Paving Technol,1957
4. Blokker PC, Van Hoorn H., Durability of bitumen in theory and practice. In: Proc fifth world petroleum congress, section VI, paper 27, June 1–5. 1959. p. 417–32.
5. Physical ageing in amorphous polymers and other materials;Struik,1978