The following publications are possibly variants of this publication:
- Learning of Recognizable Picture LanguagesRani Siromoney, Lisa Mathew, K. G. Subramanian, V. Rajkumar Dare. icpia 1992: 247-259
- Learning of Recognizable Picture LanguagesRani Siromoney, Lisa Mathew, K. G. Subramanian, V. Rajkumar Dare. ijprai, 8(2):627-639, 1994.
- P Systems Generating Hexagonal Picture LanguagesK. S. Dersanambika, Kamala Krithivasan, K. G. Subramanian. membrane 2004: 168-180 [doi]