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ACTA issues
87:3-4(2021)
87:1-2(2021)
86:3-4(2020)
86:1-2(2020)
85:3-4(2019)
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80:3-4(2014)
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79:3-4(2013)
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54:3-4(1990)
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15:3-4(1953-54)
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14:4-4(1951-52)
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13:3-4(1949-50)
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13:1-1(1949-50)
12:B-B(1950)
12:A-A(1950)
11:4-4(1946-48)
11:3-3(1946-48)
11:1-2(1946-48)
10:3-4(1941-43)
10:2-2(1941-43)
10:1-1(1941-43)
9:4-4(1938-40)
9:3-3(1938-40)
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8:4-4(1936-37)
8:2-3(1936-37)
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1:4-4(1922-23)
1:3-3(1922-23)
1:2-2(1922-23)
1:1-1(1922-23)
The lattice variety $D\circ D$
G. Grätzer, D. Kelly
Acta Sci. Math. (Szeged)
51:1-2(1987), 73-80
5236/2009