@article{10_4153_CMB_1989_044_x,
     author = {Jipsen, Peter},
     title = {Absolute {Retracts} and {Amalgamation} in {Certain} {Congruence} {Distributive} {Varieties}},
     journal = {Canadian mathematical bulletin},
     pages = {309--313},
     year = {1989},
     volume = {32},
     number = {3},
     doi = {10.4153/CMB-1989-044-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1989-044-x/}
}