G. Ludwig, 1967, Commun. Math. Phys., 4, 331, 10.1007/BF01653647
G. Ludwig, 1968, Commun. Math. Phys., 9, 1, 10.1007/BF01654027
A. J. Leggett, 1984, Essays in Theoretical Physics
J. M. Jauch, 1964, Helv. Phys. Acta, 37, 293
A. J. Leggett, 1980, Suppl. Progr. Theor. Phys., 69, 80, 10.1143/PTPS.69.80
A. Barchielli, 1982, Nuovo Cimento, 79, 10.1007/BF02894935
A. Barchielli, 1983, Found. Phys., 13, 779, 10.1007/BF01906270
V. Hakim, 1985, Phys. Rev., 32, 423, 10.1103/PhysRevA.32.423
A. J. Leggett, 1984, Contemp. Phys., 25, 583, 10.1080/00107518408210731
R. Haag, 1964, J. Math. Phys., 5, 848, 10.1063/1.1704187
G. Ludwig, 1967, Commun. Math. Phys., 4, 331, 10.1007/BF01653647
W. H. Zurek, Proceedings of the International Symposium on the Foundations of Quantum Mechanics
S. W. Hawking, 1983, Commun. Math. Phys., 87, 395, 10.1007/BF01206031
T. Banks, 1984, Nucl. Phys. B vec, 244, 125, 10.1016/0550-3213(84)90184-6
G. Lindblad, 1976, Commun. Math. Phys., 48, 119, 10.1007/BF01608499
K. Kraus, 1983, States, Effects and Operations
E. Nelson, 1966, Phys. Rev., 150, 1070, 10.1103/PhysRev.150.1079