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Adler, Ronald J.; Casey, Brendan; Jacob, Ovid C. Vacuum catastrophe: An elementary exposition of the cosmological constant problem. American Journal of Physics. 1995, 63 (7): 620–626. Bibcode:1995AmJPh..63..620A. ISSN 0002-9505. doi:10.1119/1.17850.
Adler, Ronald J.; Casey, Brendan; Jacob, Ovid C. Vacuum catastrophe: An elementary exposition of the cosmological constant problem. American Journal of Physics. 1995, 63 (7): 620–626. Bibcode:1995AmJPh..63..620A. ISSN 0002-9505. doi:10.1119/1.17850.