Visual gesture-based robot guidance with a modular neural system. - Enno Littmann; Andrea Drees; Helge J. Ritter (NIPS, 1995)

Visuelle Erkennung von Handstellungen mit neuronalen Netzen. - Andrea Drees (Infix, 1996)

Visual Gesture Recognition by a Modular Neural System. - Enno Littmann; Andrea Drees; Helge J. Ritter (ICANN, 1996)

Neural Recognition of Human Pointing Gestures in Real Images. - Enno Littmann; Andrea Drees; Helge J. Ritter (Neural Process. Lett., 1996)