Pure Appl. Chem., 1972, Vol. 32, No. 1-4, pp. 317-324
http://dx.doi.org/10.1351/pac197232010317
Spin echoes and Loschmidt's paradox
First page:

Pure Appl. Chem., 1972, Vol. 32, No. 1-4, pp. 317-324
http://dx.doi.org/10.1351/pac197232010317