@article{10_4153_CJM_1968_084_9,
     author = {Schmidt, J\"urgen},
     title = {Direct {Sums} of {Partial} {Algebras} and {Final} {Algebraic} {Structures}},
     journal = {Canadian journal of mathematics},
     pages = {872--887},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-084-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-084-9/}
}