@article{JOLT_2003_13_1_a13,
     author = {P. Graczyk and P. Sawyer},
     title = {The {Product} {Formula} for the {Spherical} {Functions} on {Symmetric} {Spaces} of {Noncompact} {Type}},
     journal = {Journal of Lie Theory},
     pages = {247--261},
     year = {2003},
     volume = {13},
     number = {1},
     doi = {10.5802/jolt.300},
     zbl = {1023.43005},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.300/}
}