The interpreted type-free modal calculus MC ∞
Rendiconti del Seminario Matematico della Università di Padova, Tome 51 (1974), pp. 1-25. 
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     author = {Bressan, Aldo},
     title = {The interpreted type-free modal calculus $MC^{\infty }$},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--25},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {51},
     year = {1974},
     zbl = {0304.02009},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1974__51__1_0/}
}
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Bressan, A. The interpreted type-free modal calculus $MC^{\infty }$. Rendiconti del Seminario Matematico della Università di Padova, Tome 51 (1974), pp. 1-25. http://www.numdam.org/item/RSMUP_1974__51__1_0/

[1] Or briefly [GIMC]: A. Bressan, A general interpreted modal calculus, Yale Press, New Haven (1972), pp. 325. | MR 401432 | Zbl 0255.02015

[2] A. Bressan, The interpreted type-free modal calculus MC∞, Part 1: The type-free extensional calculus EC∞ involving individuals, and the interpreted language ML∞ on which MC∞ is based, Rend. Sem. Mat. Univ. di Padova, 49 (1973), p. 157; Part. 2: Foundations of MC∞, Rend. Sem. Mat. Univ. Padova, 50 (1973), p. 19. | Numdam | Zbl 0279.02010

[3] E. Mendelson, Introduction to mathematical logic, Van Nostrand, New York (1963), pp. 300. | MR 164867 | Zbl 0192.01901

[4] Or briefly [IST]: J.D. Monk, Introduction to set theory, Mc Graw-Hill book Co., New York (1969), pp. 193. | MR 286668 | Zbl 0200.00066