Root-signal sets of morphological filters and their use in variable-length BTC image coding. - Qiaofei Wang; Moncef Gabbouj; Yrjö Neuvo (J. Math. Imaging Vis., 1992)

Deterministic properties of separable and cross median filters with an application to block truncation coding. - Qiaofei Wang; Yrjö Neuvo (Multidimens. Syst. Signal Process., 1993)

Root properties of morphological filters. - Qiaofei Wang; Moncef Gabbouj; Yrjö Neuvo (Signal Process., 1993)