Geodesic
Absolute Retracts and Amalgamation in Certain Congruence Distributive Varieties
Canadian mathematical bulletin, Tome 32 (1989) no. 3, pp. 309-313

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It is shown that if V is a congruence distributive variety whose members have one element subalgebras, then the class of absolute retracts of V is closed under direct products. If V is residually small, then a characterisation of the amalgamation class of V is given. 
Jipsen, Peter. Absolute Retracts and Amalgamation in Certain Congruence Distributive Varieties. Canadian mathematical bulletin, Tome 32 (1989) no. 3, pp. 309-313. doi: 10.4153/CMB-1989-044-x
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