On the expressions of the type  dF = 0 and the state and path functions in chemical thermodynamics. I. Mathematical formalism and the true significance of line integrals in chemical thermodynamics – internal energy and work

Lj. Pejov, On the expressions of the type  dF = 0 and the state and path functions in chemical thermodynamics. I. Mathematical formalism and the true significance of line integrals in chemical thermodynamics – internal energy and work, Bulletin of the Chemists and Technologists of Macedonia, 15, 119–124 (1996).