The practitioners of quantum mechanics: Described in Enz and Thellung 1960.

“Everything happens as though”: Lemaître 1934.

Zeldovich made the first genuine: Zeldovich 1967.

when particle physicists carried out: Excellent technical discussions of the cosmological constant problems can be found, eg, in Weinberg 1989, Peebles and Ratra 2003, and Carroll 2001 (updated regularly).

two teams of astronomers: The results were published by Riess et al. 1998 and Perlmutter et al. 1999. Overbye 1998 wrote a wonderful description of the discovery.