Gösta Grahne Raul Hakli Matti Nykänen Hellis Tamm Esko Ukkonen Design and implementation of a string database query language. 311-337 2003 28 Inf. Syst. 4 http://dx.doi.org/10.1016/S0306-4379(02)00075-3 db/journals/is/is28.html#GrahneHNTU03