What is the hIndex of the author who published the paper titled 'Structured Program Lookahead' in the 'Comput. Lang.' journal in 1987?
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Gordon V. Cormack and Maura R. Grossman: Unbiased Low-Variance Estimators for Precision and Related Information Retrieval. (2008) authored by Gordon V. Cormack. Haotian Zhang et al.: On-line supervised spam filter evaluation. (2008) authored by Gordon V. Cormack. Gordon V. Cormack et al.: Efficient and Effective Spam Filtering and Re-ranking for Large Web Datasets. (2019) authored by Gordon V. Cormack. Adam Roegiest and Gordon V. Cormack: University of Waterloo: Logistic Regression and Reciprocal Rank Fusion at the Microblog Track. (2012) authored by Gordon V. Cormack. Gordon V. Cormack et al.: Reciprocal rank fusion outperforms condorcet and individual rank learning methods. (2019) authored by Gordon V. Cormack. Gordon V. Cormack et al.: Quantifying Bias and Variance of System Rankings. (2019) authored by Gordon V. Cormack.
[INST]
Utilize the provided context information, to generate answers to the following question: 
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Question: What is the hIndex of the author who published the paper titled 'Structured Program Lookahead' in the 'Comput. Lang.' journal in 1987?
Context: Gordon V. Cormack and Maura R. Grossman: Unbiased Low-Variance Estimators for Precision and Related Information Retrieval. (2008) authored by Gordon V. Cormack. Haotian Zhang et al.: On-line supervised spam filter evaluation. (2008) authored by Gordon V. Cormack. Gordon V. Cormack et al.: Efficient and Effective Spam Filtering and Re-ranking for Large Web Datasets. (2019) authored by Gordon V. Cormack. Adam Roegiest and Gordon V. Cormack: University of Waterloo: Logistic Regression and Reciprocal Rank Fusion at the Microblog Track. (2012) authored by Gordon V. Cormack. Gordon V. Cormack et al.: Reciprocal rank fusion outperforms condorcet and individual rank learning methods. (2019) authored by Gordon V. Cormack. Gordon V. Cormack et al.: Quantifying Bias and Variance of System Rankings. (2019) authored by Gordon V. Cormack.
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