The most famous and frequently cited academic paper on this subject is: Title: Toilet training the retarded: A rapid program for day and nighttime independent toileting.
If you meant something else entirely (e.g., a researcher named "Oshikko" or a different field), please provide more context. But based on common academic queries, the paper is the definitive starting point. oshikko sensei
Based on the spelling and context, it is highly likely you are referring to — which translates to "Pee-Pee Teacher" or "Mr./Ms. Pee" — a well-known case study in behavioral psychology , specifically regarding operant conditioning and toilet training in children with developmental disabilities . The most famous and frequently cited academic paper
Azrin, N. H., & Foxx, R. M. (1971)
It seems you're looking for a good paper about a topic you've spelled as . Based on the spelling and context, it is
Various (e.g., Mochizuki, H., or Yamada, Y. in Japanese Journal of Behavior Analysis ).
An examination of the 'Oshikko Sensei' procedure in a Japanese special needs classroom: Modifications to the Azrin-Foxx rapid toilet training method.