[BDS] B. Balcar J. Dočkálková P. Simon: 
Almost disjoint families of countable sets. Finite and Infinite Sets, Eger, Colloq. Math. Soc. Janos Boiyai 37 (1981), 59-88. 
MR 0818228[BS] B. Balcar P. Simon: 
Disjoint refinement. Handbook of Boolean Algebras, North Holland Publ. Co. 1989, 335-386. 
MR 0991597[BV] B. Balcar P. Vojtáš: 
Almost disjoint refinement of families of subsets of N. Proc. Amer. Math. Soc. 79 (1980), 465-470. 
MR 0567994[He] S. H. Hechler: 
Generalizations of almost-disjointness, c-sets, and the Baire number of $\beta N - N$. Gen. Top. and its Appl. 8 (1978), 93-110. 
MR 0472520